After witnessing her leap onto a subway at the last moment and having her ankle crushed between the doors, Nishi reconnects with his high school sweetheart, Myon. Nishi remains deeply in love with Myon, yet he is stunned to discover that she is engaged to another man. Nishi agrees to meet Myon's fiancé at her family's Yakitori restaurant, but Yakuza members storm the establishment and murder Nishi when he attempts to prevent them from raping Myon. Nishi, now deceased, awakens and encounters a constantly shapeshifting god, who mocks him for his death. The god instructs Nishi to walk into a portal and vanish from existence, a directive Nishi rejects, opting instead to sprint past the god and reanimate. Armed with a fresh perspective on life and foreknowledge of the Yakuza's impending attack, Nishi kills one of the Yakuza with their own gun, fleeing in a stolen car alongside Myon and her sister. Acclaimed director Masaaki Yuasa's debut film, Mind Game, employs constantly shifting visuals to narrate a story about living life without regrets that is unlike any other.