Shin Megami Tensei: Devil Children

Cerberus! My partner's a chill guy!? (1x1)

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Setsuna Kai was supposed to move to a new apartment, but it was destroyed in a mysterious landslide. Distraught, Setsuna met the strange scientist Hiromi Kaname and his granddaughter Mirai. Setsuna must now travel to the Expanse with Mirai and fight demons...!?