After hearing that his estranged father is in Kumamoto, Washichiro heads to Kyushu. Along the way, he picks up a runaway girl and his friend Kinta, who is also on a pre-marital trip to Kumamoto. Despite getting caught up in various disturbances, Washichiro manages to gather information about his father in Kumamoto. Set against the backdrop of Kumamoto and Aso, Washichiro makes a final, intense run! This final installment of the series features a glamorous cast, including the heroine Miu Nakamura, regular member Shingo Yanagisawa, as well as Tatsuo Umemiya, Kiyoko Suizenji, Jun Nagasawa, Okada Masuda, and others, who help make the conclusion spectacular!

Three high school boys leave their dormitory and go to a resort and fall in love.