野野村亚美(村石千春饰)是个17岁的高中生，这一天不舒服从学校早退溜回家，看着躺在床上的哥哥博(水桥研二饰)发呆，还喃喃自语“哥哥，起床了……”博也懒得去大学上课，他只比妹妹大两岁，两人是异父异母的两兄妹，实际上没有一点血缘关系。可能因为长期相处的缘故，两兄妹间不知不觉地萌发了一份特殊的感情。
某天，他们的父母到海外出差，博代替双亲参加了亚美的家长会，商量妹妹以后的学业出路。面对班主任佐佐木(小泽和义饰)的粗暴态度，博情不自禁与他吵了起来。亚美第一次看到哥哥如此生气，最重要的是这全为了她。虽然亚美心里很高兴，但对好友由美(胜俣幸子饰)还是露出一丝责怪哥哥的口吻。回来后，亚美和由美站在自家屋顶上玩耍，由美站到了哥哥博的房间上面，亚美显得非常不悦。看到亚美那种微妙的忌妒心，博一声不吭地返回了自己的房间。就在这种僵硬的气氛中，两个人不经意之间，第一次表达出互相“喜欢”的心声。但那将意味着什么，谁也没有心思探究。
直到有一天亚美不小心感冒，发起了高烧。博时刻不离地守护着妹妹，没想到自己也被传染。半夜，博裹着毛毯溜入妹妹的房间，静悄悄地来到亚美的床前，没头没脑地问了一句“你到底喜不喜欢我……”
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