简介：
《继母的拖油瓶是我的前女友》故事描述，一对男女在某一所国中成为男女朋友，耍一阵子甜蜜，为了一点小事互相误会，生气烦躁变得多过怦然心动……后来趁著毕业的机会分手了。然而即将升上高中的两人──伊理户水斗与绫井结女，竟以意想不到的形式重逢。“当然是我当哥哥了。”“我才是姐姐，这还用说吗？”爸妈再婚对象的拖油瓶，居然是才刚分手的前任！前情侣顾虑到爸妈的心情，说好了必须遵守“谁把对方看成异性就算输”的“兄弟姊妹规定”，然而又是洗澡出来不期而遇，又是两人独处的上学放学……“当时”的回忆加上同住一个屋檐下的状况，害得两人无法不注意对方的一举一动！？
本作曾获得“这本轻小说真厉害！2020”文库部门新作第 3 名、第三届カクヨム网络小说大赛“恋爱喜剧部门”大赏，这次宣布改编动画，官方尚未宣布将以何种形式推出，对于本作有兴趣的人，可注意后续相关报导。
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