高中女孩吉冈双叶（本田翼 饰）刻意让自己显得不修边幅，以避免成为其他女生攻击的对象，每天都不得不为此小心应付，殚精竭虑。某天，她意外重逢了曾在初中时代有过交集的男孩田中洸（东出昌大 饰）。当初田中搬家到了长崎，此番重逢后不仅将姓改成了马渕，性格似乎也发生巨大的变化。以班级活动为契机，双叶、马渕、马渕的好友小凑亚耶（吉泽亮 饰）、特立独行的高冷女村尾修子（新川优爱 饰）以及因过于可爱而遭到孤立的槙田悠里（藤本泉 饰）聚到了一起。原本他们的情感便彼此交错，而隔壁班的天才帅哥菊池冬马（千叶雄大 饰）、教师田中阳一（小柳友 饰）以及马渕在长崎的旧友成海唯（高畑充希 饰）又让男孩女孩们的关系更为复杂，于是平添了无数的烦恼……
本片根据漫画家咲坂伊绪的同名原作改编。
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