あの夏、出会ってしまったのは やんごとない秘密--。 水難救助隊になりたくて強豪の翠凛館高校水泳部に入部した山杉汐音。だけど、筋肉フェチゆえに周りの部員の筋肉が気になりすぎて全然練習に集中できない! 同じく1年でエースの海虎くんはいつも筋肉が隠れるラッシュガードを着用。汐音の唯一の救いだったはずが、ある事件をきっかけに彼が肌を隠し続ける秘密を知ってしまい…!?
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