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Two different high school children - a swimmer and an academic - set off on a quest together one summer.
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Moka Kamishiraishi
Sakuta Minami

Kanata Hosoda
Moji Shouhei

Yuki Saito
Minami's Mother

Etsushi Toyokawa
Minami's Biological Father

Yudai Chiba
Moji's Older Brother

Kanji Furutachi
Minami's Stepfather

Tōru Shinagawa
Moji's Grandfather

Hina Yukawa
Miyaji

Miyu Tomita
Koteko (voice)

Daisuke Namikawa
Count Cement (voice)

Takahiro Sakurai
Mortar (voice)

Tatsuhisa Suzuki
Concretarō (voice)

Show Hayami
Prince Shōtoku (voice)