One Summer Story

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)