City of KAINAN locates in Wakayama prefecture, Japan. Actually, it is not famous even in Japan; however, it contains important history and attractive culture. Kumano Kodo, listed on UNESCO World Heritage, starts from KAINAN, and place of origin of mandarin is KAINAN as well. Yasobe IZAWA, who is one of the most important civil engineering technicians in Japanese history, was born in KAINAN around 300 years ago. He constructed a turtle pond (tank) in KAINAN. The pond has enriched agriculture and daily lives in KAINAN; furthermore, the area around the pond is famous for SAKURA and loved by local dwellers. The theme song of this film is MARI TO TONOSAMA (A ball and King). This song is a famous children song in Japan, and about the history of Wakayama. The song and the tradition have been inherited from mothers to their children in KAINAN.