Back in his high school years, Kazama Masamune had a girlfriend four years his senior, who one day left to go study abroad. Now, six years later, Kazama hears that his girlfriend has passed away, and that she had secretly given birth to their daughter, who is now five years old. Kazama then decides to raise his daughter on his own.

A housewife who has been married for 20 years, she arrives in downtown Tokyo eager to start over to straighten out her life.

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!

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