When he hears her favorite Beatles song, Toru Watanabe remembers his first love, Naoko, who was his best friend Kizuki's girlfriend. He is instantly transported nearly twenty years back to his student days in Tokyo, lost in a world filled with uncomfortable friendships, casual sex, passion, loss, and desire – a time when an impulsive young woman named Midori enters his life, forcing him to choose between the future and the past.