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HTML 

              
                <div class="main">
  <div class="sidebar-hover">
    <p class="pagination">
      <span class="page">01</span> / <span class="total-pages">08</span>
    </p>
  </div>
  <div class="sidebar-real">
    <div data-page="1" class="nav-elem nav-1 active"></div>
    <div data-page="2" class="nav-elem nav-2"></div>
    <div data-page="3" class="nav-elem nav-3"></div>
    <div data-page="4" class="nav-elem nav-4"></div>
    <div data-page="5" class="nav-elem nav-5"></div>
    <div data-page="6" class="nav-elem nav-6"></div>
    <div data-page="7" class="nav-elem nav-7"></div>
    <div data-page="8" class="nav-elem nav-8"></div>
  </div>
  <div class="sections">
    <div class="section section-1">
      <div class="left-part"></div>
      <div class="content">
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <h2 class="section-heading">Fancy heading #1</h2>
        <p class="additional-text">Some cool info or hashtags #1</p>
      </div>
    </div>
    <div class="section section-2">
      <div class="left-part"></div>
      <div class="content">
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <h2 class="section-heading">Fancy heading #2</h2>
        <p class="additional-text">Some cool info or hashtags #2</p>
      </div>
    </div>
    <div class="section section-3">
      <div class="left-part"></div>
      <div class="content">
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <h2 class="section-heading">Fancy heading #3</h2>
        <p class="additional-text">Some cool info or hashtags #3</p>
      </div>
    </div>
    <div class="section section-4">
      <div class="left-part"></div>
      <div class="content">
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <h2 class="section-heading">Fancy heading #4</h2>
        <p class="additional-text">Some cool info or hashtags #4</p>
      </div>
    </div>
    <div class="section section-5">
      <div class="left-part"></div>
      <div class="content">
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <h2 class="section-heading">Fancy heading #5</h2>
        <p class="additional-text">Some cool info or hashtags #5</p>
      </div>
    </div>
    <div class="section section-6">
      <div class="left-part"></div>
      <div class="content">
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <h2 class="section-heading">Fancy heading #6</h2>
        <p class="additional-text">Some cool info or hashtags #6</p>
      </div>
    </div>
    <div class="section section-7">
      <div class="left-part"></div>
      <div class="content">
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <h2 class="section-heading">Fancy heading #7</h2>
        <p class="additional-text">Some cool info or hashtags #7</p>
      </div>
    </div>
    <div class="section section-8">
      <div class="left-part"></div>
      <div class="content">
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <div class="bg-part"></div>
        <h2 class="section-heading"><a class="codepen-link" href="https://codepen.io/suez/public/" target="_blank">Fancy heading #8</a></h2>
        <p class="check-out additional-text">Check out my other <a href="https://codepen.io/suez/public/" target="_blank">pens</a></p>
      </div>
    </div>
  </div>
  <h2 class="scroll-down">Scroll down</h2>
</div>
!

CSS 

              
                @import "compass/css3";

@font-face {
  src: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/142996/PFDinTextCompPro-Medium.ttf);
  font-family: pfd-medium;
}
@font-face {
  src: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/142996/PT_Sans-Web-Regular.ttf);
  font-family: ptsans-regular;
}
*, *:before, *:after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
@mixin setBg($url) {
  .left-part {
    background-image: url($url);
  }
  .bg-part {
    background-image: url($url);
  }
}
// change this, if you need more nav-items animated on sidebar hover
$maxNavItems: 10;
// affects sliding sidebar width and height of nav-items
$realSidebarWidth: 30rem;
html, body {
  font-size: 62.5%; // makes 1 rem = 10px
  overflow: hidden;
}
.main {
  width: 100%;
  height: 100vh;
  overflow: hidden;
  background: #000;
}
.sidebar-hover,
.sidebar-real,
.left-part,
.content,
.bg-part{
  position: absolute;
  top: 0;
  height: 100%;
}

/* END OF GLOBAL STYLES */

/* SIDEBAR HOVER STYLES */
.sidebar-hover {
  position: fixed;
  z-index: 100;
  left: 0;
  width: 15rem;
  
  &:after {
    content: "";
    display: block;
    width: 1px;
    height: 100%;
    position: absolute;
    top: 0;
    right: 0;
    background: rgba(255,255,255,.5);
  }
  
  &:hover ~ .sidebar-real {
    max-width: $realSidebarWidth;
  }
  &:hover ~ .sidebar-real .nav-elem {
    transform: translateX(0);
    
    @for $i from 1 through $maxNavItems {
      &.nav-#{$i} {
        transition-delay: 0.4s + ($i - 1) * 0.15s;
      }
    }
  }
  &:hover ~ .sections .content {
    transform: translateX($realSidebarWidth);
  }
}

.pagination {
  z-index: 500;
  position: absolute;
  font-size: 1.6rem;
  font-family: ptsans-regular;
  top: 26.7rem;
  left: 0rem;
  width: 15rem;
  text-align: center;
  color: rgba(255,255,255, 0.5);
  padding: 0.5rem;
  background: rgba(0,0,0, 0.4);
  
  &:after {
    content: ">";
    color: #fff;
    position: absolute;
    display: block;
    right: 3rem;
    top: 0.5rem;
    animation: navArrowMove 1s infinite;
  }
  
  /*
  &:before {
    content: "";
    display: block;
    position: absolute;
    top: -0.5rem;
    right: -0.2rem;
    height: 4rem;
    width: 0.5rem;
    border-radius: 5px;
    background: rgba(255,255,255, 0.9);
  }*/
  
  .page {
    color: #fff;
  }
}

/* END OF SIDEBAR HOVER */

/* REAL SIDEBAR (OFF-CANVAS MENU) STYLES */
.sidebar-real {
  z-index: 200;
  left: 15rem;
  width: $realSidebarWidth;
  height: 500rem;
  max-width: 0;
  background: #000;
  overflow: hidden;
  transition: max-width 0.4s 0.2s, transform 0.3s;
  will-change: max-width, transform;
  
  &:hover {
    max-width: $realSidebarWidth;
  }
  &:hover .nav-elem {
    transform: translateX(0);
    
    @for $i from 1 through $maxNavItems {
      &.nav-#{$i} {
        transition-delay: 0.4s + ($i - 1) * 0.15s;
      }
    }
  }
  &:hover ~ .sections .content {
    transform: translateX($realSidebarWidth);
  }
}

.nav-elem {
  position: relative;
  width: 100%;
  height: $realSidebarWidth * 0.627;
  background-size: cover;
  transition: transform 0.4s 0.3s;
  will-change: transform;
  transform: translateX(-100%);
  cursor: pointer;
  
  &:after {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    display: block;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.4);
    transition: background 0.2s;
    will-change: background;
  }
  
  &:hover:after {
    background: rgba(0,0,0,0);
  }
  
  &.nav-1 {
    background-image: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/142996/2side-pagi-1.jpg');
  }
  &.nav-2 {
    background-image: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/142996/scr-split-2.jpg');
  }
  &.nav-3 {
    background-image: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/142996/ironman.jpg');
  }
  &.nav-4 {
    background-image: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/142996/sections-3.jpg');
  }
  &.nav-5 {
    background-image: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/142996/captainamerica.jpg');
  }
  &.nav-6 {
    background-image: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/142996/blackwidow.jpg');
  }
  &.nav-7 {
    background-image: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/142996/sections-4.jpg');
  }
  &.nav-8 {
    background-image: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/142996/thor.jpg');
  }
  
}
/* REAL SIDEBAR STYLES END */

/* SECTIONS STYLES */

.sections {
  height: 100%;
  transition: margin 0.5s;
  will-change: margin;
}

.section {
  position: relative;
  height: 100%;
  
  &.section-1 {
    @include setBg('https://s3-us-west-2.amazonaws.com/s.cdpn.io/142996/2side-pagi-1.jpg');
  }
  &.section-2 {
    @include setBg('https://s3-us-west-2.amazonaws.com/s.cdpn.io/142996/scr-split-2.jpg');
  }
  &.section-3 {
    @include setBg('https://s3-us-west-2.amazonaws.com/s.cdpn.io/142996/ironman.jpg'); 
  }
  &.section-4 {
    @include setBg('https://s3-us-west-2.amazonaws.com/s.cdpn.io/142996/sections-3.jpg');
  }
  &.section-5 {
    @include setBg('https://s3-us-west-2.amazonaws.com/s.cdpn.io/142996/captainamerica.jpg');
  }
  &.section-6 {
    @include setBg('https://s3-us-west-2.amazonaws.com/s.cdpn.io/142996/blackwidow.jpg');
  }
  &.section-7 {
    @include setBg('https://s3-us-west-2.amazonaws.com/s.cdpn.io/142996/sections-4.jpg');
  }
  &.section-8 {
    @include setBg('https://s3-us-west-2.amazonaws.com/s.cdpn.io/142996/thor.jpg');
  }
}

.left-part,
.bg-part {
  background-size: cover;
  background-repeat: no-repeat;
  background-position: 50% 50%;
  background-attachment: fixed;
  // css transforms not working with background-attachment: fixed
  transition: margin 0.8s;
  will-change: margin;
}

.left-part {
  z-index: 20;
  left: 0;
  width: 15rem;
  transition-delay: 1s;
}

.content {
  left: 15rem;
  width: calc(100% - 15rem);
  height: 100%;
  transition: transform 0.4s 0.2s;
  will-change: transform;
}

.section-heading,
.additional-text {
  display: block;
  position: absolute;
  z-index: 700;
  color: #fff;
  line-height: 1;
  transition: transform 0.4s, opacity 0.1s, color 0.3s;
  will-change: transform, opacity;
  
  &.not-visible {
    transform: translateY(-10rem);
    opacity: 0;
    transition: transform 0.4s, opacity 0.2s 0.2s;
  }
}

.section-heading {
  top: 26.7rem;
  left: 0;
  font-size: 6rem;
  text-transform: uppercase;
  line-height: 1;
  font-family: pfd-medium;
  padding: 0 2rem 4rem;
  background: rgba(0,0,0, 0.4);
  cursor: pointer;
  
  &:hover {
    color: rgba(255, 89, 89, 0.7);
  }
}

.additional-text {
  top: 33.2rem;
  left: 2rem;
  font-size: 2rem;
  text-transform: uppercase;
  font-family: ptsans-regular;
}

.bg-part {
  width: 12.5%;
  
  &:nth-child(4) {
    transition-delay: 0.4s;
  }
  &:nth-child(3),
  &:nth-child(5){
    transition-delay: 0.6s;
  }
  &:nth-child(2),
  &:nth-child(6) {
    transition-delay: 0.8s;
  }
  &:nth-child(1),
  &:nth-child(7) {
    transition-delay: 1s;
  }
  &:nth-child(8) {
    transition-delay: 1.2s;
  }
  
  @for $i from 1 through 8 {
    &:nth-child(#{$i}) {
      left: ($i - 1) * 12.5%;
    }
  }
}

.scroll-down {
  position: fixed;
  z-index: 500;
  transition: transform 0.5s 1.5s, opacity 0.3s 1.7s, z-index 0.5s 1.5s;
  font-size: 3rem;
  font-family: ptsans-regular;
  text-transform: uppercase;
  bottom: 8rem;
  left: calc(50% - 15rem);
  color: #fff;
  width: 30rem;
  text-align: center;
  
  &.removed {
    transform: translateY(-20rem);
    opacity: 0;
    z-index: -10;
    transition: transform 0.5s, opacity 0.3s 0.2s, z-index 0.5s;
  }
  
  &:after {
    content: "";
    position: absolute;
    display: block;
    bottom: -3rem;
    left: calc(50% - 1.5rem);
    width: 3rem;
    height: 3rem;
    border: 0.5rem solid #fff;
    border-left: none;
    border-top: none;
    transform-origin: 50% 50%;
    transform: rotate(45deg);
    animation: arrowMove 1.2s infinite;
  }
}

@keyframes arrowMove {
  to {
    transform: rotate(45deg) translateY(2rem) translateX(2rem);
    opacity: 0;
  }
}
@keyframes navArrowMove {
  to {
    transform: translateX(2rem);
    opacity: 0;
  }
}
.codepen-link {
  color: inherit;
  text-decoration: none;
}
.check-out {
  a {
    color: rgba(255,170,170,1);
  }
}
!

JS 

              
                'use strict';
// Abandon all hope ye who enter here
$(document).ready(function() {
  
  var navigating = false,
      curPage = 1,
      pages = $(".section").length,
      $sections = $(".sections"),
      $paginationPage = $(".pagination .page"),
      $paginationTotal = $(".total-pages"),
      $textStuff = $(".section-heading, .additional-text");
  
  if (pages >= 10) {
    $paginationTotal.text(pages);
  } else {
    $paginationTotal.text("0" + pages);
  }
  
  /*
  Sets random transition-delay for blocks between 0.4 and 1.2 seconds on every call
  */
  function randomDelay() {
    $(".left-part").css("transition-delay", (Math.floor(Math.random() * 9) + 4)/10 + "s");
    for (var i = 1; i <= pages; i++) {
      $(".bg-part:nth-child("+i+")").css("transition-delay", (Math.floor(Math.random() * 9) + 4)/10 + "s");
    }
  }
  
  /* Async hell, with hardcoded numbers.
  On production, 410 number must be .section-heading transform transition time in miliseconds + 10, but i'm sort of tired of this demo :D
  */
  function timeoutNav(t) {
    var time = t || 2000;
    $textStuff.addClass("not-visible");
    setTimeout(function() {
      navigating = false;
      randomDelay();
    }, time);
    setTimeout(function() {
      // cached selector not working because of newely created clone when moving up more then 2 positions
      $(".section-heading, .additional-text").css({"margin-top": 0 - (parseInt($(".nav-elem.active").attr("data-page")) - 1) * 100 + "vh"}).hide();
    }, 410);
    setTimeout(function() {
      $textStuff.show();
      $textStuff.css("top");
      $textStuff.removeClass("not-visible");
    }, time + 10);
  }
  
  function magicStuff(paramPage) {
    if (paramPage) curPage = paramPage;
    navigating = true;
    var calculatedMargin = 0 - (curPage - 1) * 100;
    $(".bg-part, .left-part").css("margin-top", calculatedMargin +"vh");
    $(".scroll-down").addClass("removed");
    if (parseInt($(".nav-elem.active").attr("data-page")) === 1) {
      $(".scroll-down").removeClass("removed");
    }
  }
  
  function trickyStuff(page) {
    $(".left-part, .bg-part").css({"transition-duration": "0s", "transition-delay": "0s"});
    $(".main").css("top");
    magicStuff(page);
    $(".main").css("top");
    $(".left-part, .bg-part").css("transition-duration", "0.8s");
    randomDelay();
  }
  
  function pagination(pg) {
    $(".nav-elem").removeClass("active");
    $(".nav-" + pg).addClass("active");
    curPage = pg;
    
    if (pages >= 10) {
      $paginationPage.text(pg);
    } else {
      $paginationPage.text("0" + pg);
    }
  }
  
  function navigateUp() {
    if (curPage > 1) {
      curPage--;
      pagination(curPage);
      magicStuff();
      timeoutNav();
    }
  }
  
  function navigateDown() {
    if (curPage < pages) {
      curPage++;
      pagination(curPage);
      magicStuff();
      timeoutNav();
    }
  }
  
  $(document).on("mousewheel DOMMouseScroll", function(e) {
    if (!navigating) {
      if (e.originalEvent.wheelDelta > 0 || e.originalEvent.detail < 0) {
        navigateUp();
      } else { 
        navigateDown();
      }
    }
  });
  
  $(document).on("mousewheel DOMMouseScroll",
                 ".sidebar-hover, .sidebar-real",
                 function(e) {
    e.stopPropagation();
  });
  
  var sidebarScroll = 0,
      $navEl =  $(".nav-elem"),
      $sidebar = $(".sidebar-real"),
      maxScroll = $navEl.length * $navEl.height() - $(window).height();
  
  $(document).on("mousewheel DOMMouseScroll", ".sidebar-real", function(e) {
    if (navigating) return;
    if (e.originalEvent.wheelDelta > 0 || e.originalEvent.detail < 0) {
      if (!sidebarScroll) return;
      sidebarScroll += 100;
      if (sidebarScroll > 0) sidebarScroll = 0;
    } else { 
      if (Math.abs(sidebarScroll) === maxScroll) return;
      sidebarScroll -= 100;
      if (Math.abs(sidebarScroll) > maxScroll) sidebarScroll = 0 - maxScroll;
    }
    $sidebar.css("transform", "translateY("+ sidebarScroll +"px)");
  });
  
  $(document).on("click", ".nav-elem:not(.active)", function() {
    if (navigating) return;
    var activePage = parseInt($(".nav-elem.active").attr("data-page"), 10),
        futurePage = $(this).attr("data-page");
    
    pagination(futurePage);
    
    if (Math.abs(activePage - futurePage) > 2) {
      var $fakePage = $(".section-" + futurePage).clone(),
          $currentPage = $(".section-" + activePage),
          fakeNumber = 0;
      // ugly code, do not enter here
      if (activePage < futurePage) {
        // moving down
        $currentPage.after($fakePage);
        fakeNumber = activePage + 1;
        $(".main").css("top");
        randomDelay();
        magicStuff(fakeNumber);
      } else {
        // moving up (real hell)
        $currentPage.before($fakePage);
        fakeNumber = activePage - 1;
        trickyStuff(activePage + 1);
        $(".main").css("top");
        randomDelay();
        $(".main").css("top");
        magicStuff(activePage);
      }
      timeoutNav(2050);
      setTimeout(function() {
        $fakePage.remove();
        trickyStuff(futurePage);
      }, 2000);
    } else {
      magicStuff(futurePage);
      timeoutNav();
    }
  });
  
  $(window).resize(function() {
    maxScroll = $navEl.length * $navEl.height() - $(window).height();
    $sidebar.css("transform", "translateY(0)");
  });
  
});
!
999px

Console