天川千夏

市立藤林高校二年级学生，是直树的同班同学兼青梅竹马的表妹。一直都黏着直树。 　　小时候两人曾经订过婚，不过现在因为家庭的关系取消了婚约，但千夏本人还是自称是直树的妻子。 　　从早到晚二十四小时都在意着直树的事情，所以每天一起上下学，在学校里也是经常在一起。 「千夏我，是直树的妻子！」

简介来自 Bangumi

Chinatsu is a second-year student at the private Tōrin high school and is a classmate of Naoki's. In addition, she's Naoki's cousin ans childhhood friend. As Chinatsu is concerned about Naoki at all times, she commutes to school with him and is always around him during school hours. She appears to be an airhead, and a self-proclaimed bride of the hero. This "bride" term is not entirely made up by her, in fact, Chinatsu was assigned to be Naoki's fiance from birth, but after Naoki's qualification of a heir to the Serizawa family has been deprived, their official unity has been broken. So Chinatsu has become the main heir of the Serizawa household. [Taken from Wikipedia and translated from http://ja.wikipedia.org/wiki/Memories_Off%E3%82%B7%E3%83%AA%E3%83%BC%E3%82%BA%E3%81%AE%E7%99%BB%E5%A0%B4%E4%BA%BA%E7%89%A9#.E3.83.A1.E3.83.A2.E3.83.AA.E3.83.BC.E3.82.BA.E3.82.AA.E3.83.95_.E3.82.86.E3.81.B3.E3.81.8D.E3.82.8A.E3.81.AE.E8.A8.98.E6.86.B6.E5.88.9D.E5.87.BA.]

简介来自 VNDB