植物学家有津在年轻的时候参与了一次自愿捐精，并且记住了受助者宗宫佐衣子的名字。十年后，有了美满家庭的有津，重遇已成为单亲妈妈的佐衣子，面对十年前就生下了他的儿子的佐衣子，有津情不自禁地深深爱上了她，和她有了爱的结晶。然而基因的羁绊与伦理的宿命使有津陷入了深深的矛盾之中，北海道那飘着紫丁香花瓣的街道，会将他引向何处......
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