Kei and Atsuo were both enrolled in summer school. Kei was an honor student, and Atsuo was the polar opposite - but opposites attract. After school, the two head to the beach, where they find another student from their school competing against a local gang member, to see who is able to hold his breath longer under water. Overwhelmed by the excitement, Kei and Atsuo decide to try themselves.
森下愛子
as Kei Arishima
永島敏行
as Atsuo Kuwata
小林薫
as Eisuke Morimoto
島村佳江
as Yu Arishima
鈴木瑞穂
as Takahide Moromoto
小沢栄太郎
as Kazutaka Oyagi
深江章喜
as Gang Leader
下條アトム
as Sakakibara
