One year ago, Yūta lost his father in a car crash. Now in the 6th grade, Yūta goes to catch beetles in a dam near a mountain, a place he often went with his father. There, Yūta meets a strange old man, and while walking in heavy rainfall, slips and blacks out. When Yūta awakes, he sees a child, Saeko, who shows him a village from the past. A precious summer vacation for Yūta begins.
| Actor | Role |
|---|---|
 Akashi TakeiYūta Otabe (voice) | Yūta Otabe (voice) |
| AAyumi KimuraSaeko Okuyama (voice) | Saeko Okuyama (voice) |
 Taro IshidaHotaru Jii (voice) | Hotaru Jii (voice) |
 Chikao OhtsukaAotengu (voice) | Aotengu (voice) |
 Ikuko TaniObā-chan (voice) | Obā-chan (voice) |
 Yuuki YagiNot listed | Not listed |
 Kazuya NakaiKenzō – Adult (voice) | Kenzō – Adult (voice) |
 Mamiko NotoSaeko – Adult (voice) | Saeko – Adult (voice) |
 Masahiko TanakaSaeko's Father (voice) | Saeko's Father (voice) |
 Yutaro HonjoShintarō (voice) | Shintarō (voice) |
| YYuuki YagiYoshizawa (voice) | Yoshizawa (voice) |