上白石萌歌
— Sakuta Minami
細田佳央太
— Moji Shouhei
Yuki Saito
— Minami's Mother
豊川悦司
— Minami's Biological Father
千葉雄大
— Moji's Older Brother
Kanji Furutachi
— Minami's Stepfather
品川徹
— Moji's Grandfather
Hina Yukawa
— Miyaji
富田美憂
— Koteko (voice)
Daisuke Namikawa
— Count Cement (voice)
Takahiro Sakurai
— Mortar (voice)
Tatsuhisa Suzuki
— Concretarō (voice)
Shō Hayami
— Prince Shōtoku (voice)