During his second year of high school, Kuniyoshi discovers that his childhood friend Taishi has fallen for one of their classmates, Tadashi Matsuda. Though secretly in love with Taishi himself, Kuniyoshi chooses to bury his own feelings and support his friend’s hesitant attempts at confession. But Taishi never finds the courage to speak his heart. However, during the winter before the end of their senior year, Taishi, shaken by the discovery that Matsuda prefers long hair, fails his university entrance exams. Kuniyoshi then pushes his friend to grow his hair out and try again.

'Which is more important, me or him?' Miyako, a freelance writer, and Aki, a junior high school teacher, are lovers. One day, however, he suddenly loses contact with Aki, who is on his way to a club training camp. Driven by anxiety, Miyako looks up and sees Aki, a high school student, in front of him. Confused by the unbelievable situation, Miyako decides to have sex with the high school student Aki, hoping to get back to the "Aki of today" as soon as possible. However, nothing changes afterwards, and the "Aki of today" returns home without incident. From that day onwards, a mysterious life with the two Akis begins...?