Two different high school children - a swimmer and an academic - set off on a quest together one summer.
Shuichi OkitaDirector
Sakuta Minami
Moji Shouhei
Minami's Mother
Minami's Biological Father
Moji's Older Brother
Minami's Stepfather
Moji's Grandfather
Miyaji
Koteko (voice)
Count Cement (voice)
Mortar (voice)
Concretarō (voice)
Prince Shōtoku (voice)
