这是一部描绘男男禁断恋的影片。该片和同时上映的《同级生》是姐妹片，都根据鹿目萤子的小说改编，两部影片人物相同，叙述了两个不同维度的故事。 三年级的柴原润（中村优一 饰）是学校游泳部的王牌选手，然而在一场争夺高中游泳大赛出场权的比赛中，他败给了村井。游泳部的教练——也就是润的父亲——要求他专心念书...，好好准备考大学，别再花心思在游泳上了。受到打击的润很消沉，不料，刚刚击败他的村井竟跑来请他当自己的个人指导。润答应了他，认真地帮助他训练。不久后，润开始全力投入学习，不再去游泳部参加活动。村井竟然以润的缺席为理由提出了退部申请。这天夜里，润赶去游泳池找村井，村井吻了他。村井的所作所为让润非常烦恼，他把一切都告诉了和自己一起长大的好朋友加藤翔一。在游泳大赛当日，润没有前往观战，村井因此弃权。随后，他离开了日本，飞赴美国……
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