Junior high school student Yuna lives with her father Toshiharu. Her mother Akemi moved to Naha when her older sister entered high school, and Yuna is worried about her father's life after she leaves.

Leaving on the 15th Spring

Masashi, a 15 years old school boy and so-called 'overprotected child', lives with his parents in the suburbs of Tokyo. Poised to graduate from middle school as per his parents' hope and expectations, Masashi experiences an incident during spring break that changes his life forever.