Toru Watanabe is a quiet and serious young man in 1960s Tokyo whose personal life is in tumult, having lost his best friend Kizuki after he inexplicably commits suicide. Seeking an escape, Toru enters a university in Tokyo. By chance, during a walk in a park, Toru meets Kizuki's ex-girlfriend Naoko, and they grow close. Naoko continues to be devastated by the loss of Kizuki and spirals into a deep clinical depression.<ref name="fujitv"></ref>