当一名少年第一次了解到这世界上有所谓ＳＥＸ这样东西的存在时，一定都会想“我第一次做「那件事」的对方究竟会是什么样的女孩子”。椿明和卜部美琴这两个刚开始交往的高中生，对椿来说，卜部是个充满谜团的女孩，而这谜团也正待他去揭开…… 我交了自出生以来的第一个女朋友，女朋友的名字叫做卜部美琴。 她是个一到午休就趴着睡觉不爱说话的女孩，几乎没有和任何一个班上的同学有来往。 而我和她的交往这件事是属于我们两个人的秘密。 放学后在校外互相等候一起回家是我们两人每天必做的事。在回家的路上，有时害羞，有时愤怒，她让我一个人看到她在学校没有让其他人看到的表情。当我看到她的真实表情时，我也变得越来越喜欢她……

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