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HTML 

              
                <section class="p-plan-inner">
  <div class="p-plan-wrapper">
    <div class="p-plan__main">
      <ul class="plan__items_wrap">
        <li class="p-plan__item fadeInLeftTriggerOnce">
          <section>
            <h3 class="title">タイトル表記</h3>
            <div class="box">
              <p>内容表示内容表示内容表示内容表示内容表示内容表示内容表示内容表示内容表示内容表示内容表示内容表示内容表示</p>
            </div>
          </section>
        </li>
        <li class="p-plan__item fadeInLeftTriggerOnce">
          <section>
            <h3 class="title">タイトル表記</h3>
            <div class="box">
              <p>内容表示内容表示内容表示内容表示内容表示内容表示内容表示内容表示内容表示内容表示内容表示内容表示内容表示</p>
            </div>
          </section>
        </li>
        <li class="p-plan__item fadeInLeftTriggerOnce">
          <section>
            <h3 class="title">タイトル表記</h3>
            <div class="box ">
              <p>内容表示内容表示内容表示内容表示内容表示内容表示内容表示内容表示内容表示内容表示内容表示内容表示内容表示</p>
            </div>
          </section>
        </li>
        <li class="p-plan__item fadeInLeftTriggerOnce">
          <section>
            <h3 class="title">タイトル表記</h3>
            <div class="box ">
              <p>内容表示内容表示内容表示内容表示内容表示内容表示内容表示内容表示内容表示内容表示内容表示内容表示内容表示</p>
            </div>
          </section>
        </li>

      </ul>
    </div>
  </div>
</section>

<script src="https://code.jquery.com/jquery-3.4.1.min.js" integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo=" crossorigin="anonymous"></script>
!

CSS 

              
                @charset "UTF-8";
/*見た目の変更CSS*/
.p-plan-inner {
  margin: 0;
  padding: 5.125rem 0 10.125rem 0;
  background: #d0cecf;
  position: relative;
}

/*凸凹用のCSS*/
.plan__items_wrap {
  display: block;
  width: 550px;
  max-width: 550px;
  width: 43vw;
}

.p-plan__item {
  display: block;
  position: relative;
  z-index: 2;
}

.p-plan__item + .p-plan__item {
  margin-top: 0.6rem;
  width: 43vw;
}

.p-plan__item:nth-child(1) {
  width: 63vw;
}

.p-plan__item:nth-child(2n) {
  width: 53vw;
}

.p-plan__item:nth-child(5n) {
  width: 63vw;
}

/*アコーディオン全体*/
.accordion-area {
  list-style: none;
  width: 96%;
  max-width: 900px;
  margin: 0 auto;
}

.accordion-area li {
  margin: 10px 0;
}

.accordion-area section {
  border: 1px solid #ccc;
}

/*アコーディオンタイトル*/
.title {
  position: relative; /*マークの位置基準とするためrelative指定*/
  cursor: pointer;
  font-size: 1rem;
  font-weight: normal;
  padding: 3% 3% 3% 50px;
  transition: all 0.5s ease;
  background-color: #fff;
  border-radius: 0 10rem 10rem 0;
  font-size: 1.4rem;
}

/*▲アイコン表示*/
h3.title:after {
  -webkit-transform: translateX(-50%);
  position: absolute;
  top: 36%;
  right: 2vw;
  width: 18px;
  height: 18px;
  transform: translate(-50%);
  background: url(https://demo4.okimono.life/wp-content/uploads/2024/03/sankaku-brown.png)
    no-repeat center center / contain;
  content: "";
}
@media screen and (min-width: 760px) h3.title:after {
  top: 36%;
  width: 25px;
  height: 25px;
}

/*アコーディオンで現れるエリア*/
.box {
  display: none; /*はじめは非表示*/
  background: #f3f3f3;
  margin: 0 3% 3% 3%;
  padding: 3%;
}
!

JS 

              
                //スクロールをしたら左から出てくるアニメーション
$(".fadeInLeftTriggerOnce").on("inview", function (event, isInView) {
  if (isInView) {
    //表示領域に入った時
    $(this).addClass("animate__animated animate__fadeInLeft"); //クラス名が付与
  }
});

//アコーディオンをクリックした時の動作
$(".title").on("click", function () {
  //タイトル要素をクリックしたら
  $(".box").slideUp(500); //クラス名.boxがついたすべてのアコーディオンを閉じる

  var findElm = $(this).next(".box"); //タイトル直後のアコーディオンを行うエリアを取得

  if ($(this).hasClass("close")) {
    //タイトル要素にクラス名closeがあれば
    $(this).removeClass("close"); //クラス名を除去
  } else {
    //それ以外は
    $(".close").removeClass("close"); //クラス名closeを全て除去した後
    $(this).addClass("close"); //クリックしたタイトルにクラス名closeを付与し
    $(findElm).slideDown(500); //アコーディオンを開く
  }
});

//ページが読み込まれた際にopenクラスをつけ、openがついていたら開く動作※不必要なら下記全て削除
$(window).on("load", function () {
  $(".accordion-area li:first-of-type section").addClass("open"); //accordion-areaのはじめのliにあるsectionにopenクラスを追加
  $(".open").each(function (index, element) {
    //openクラスを取得
    var Title = $(element).children(".title"); //openクラスの子要素のtitleクラスを取得
    $(Title).addClass("close"); ///タイトルにクラス名closeを付与し
    var Box = $(element).children(".box"); //openクラスの子要素boxクラスを取得
    $(Box).slideDown(500); //アコーディオンを開く
  });
});
!
999px

Console