Chainsaw Man - The Movie: Reze Arc

Following Katana Man's defeat, Public Safety division leader Makima assigns the fanatical shark devil Beam as temporary partner to the devil hunter Denji (Chainsaw Man) while his regular partner Power has her excess blood drained. Makima takes Denji on a six-film movie marathon date; both dislike all but the final film in the program, which moves them to tears. During the date, Makima reassures Denji that he has a heart capable of feeling.

Denji is caught in a storm while patrolling and takes shelter in a phone booth, where he meets a girl named Reze and later visits her at the café where she works. Her behavior leads Denji to think she has feelings for him, though he is conflicted over his simultaneous attraction to Makima. Meanwhile, devil hunter Aki Hayakawa is assigned the Angel Devil as his new partner, whose touch shortens the lifespan of mortals. Angel's laziness and apathy towards humans become sources of mutual tension.

Denji and Reze sneak into her school at night, where they skinny dip in the outdoor pool and she teaches him to swim. While separated from Denji, Reze is suddenly ambushed by an assassin who aims to torture her to control Denji; she feigns weakness before quickly killing the man and allying with his partnered devil, the Typhoon Devil. The day after, while watching fireworks at a festival, Reze asks Denji to run away with her. He hesitates, leading to her realization that there's another woman in Denji's life. Reze then kisses him, bites out his tongue, and incapacitates him revealing her true identity as the Bomb Devil.

Beam retreats with the injured Denji to a Public Safety office, where they find Aki and Angel; the four escape by car as Reze slaughters the other hunters. As she chases them through the streets, a revived Denji retaliates but is easily defeated. Aki and the Violence Fiend fend off Reze, but the Typhoon Devil arrives to assist her. Denji is revived by Angel using the blood of a nearby casualty and Beam suggests using his chainsaw abilities tactically in the fight, giving Denji the idea to ride Beam's shark form in the battle. Amidst the fight, the Typhoon Devil's winds pull in Angel before Aki catches his shirt. Intent on dying, Angel begs him to let go but Aki secures him by grabbing his bare hand, taking two months off his remaining two-year lifespan.

Denji and Beam kill the Typhoon Devil, though Reze severely injures Beam. The confrontation leads them to the coastline, where Denji uses his chains to bind Reze to him and jumps into the water, preventing her from using her abilities as they sink to the seabed. All three wash ashore the following morning, where Reze concedes that her mission has failed and she never had feelings for Denji. He replies that if that were truly the case, she would not have taught him to swim. Denji then reciprocates Reze's offer to run away together and asks her to meet at the café the next day.

In the aftermath of the battle, devil hunter Kishibe informs Aki that Reze was a Soviet agent experimented on as a child. Reze prepares to board a train before having a change of heart and deciding to meet with Denji. However, she is intercepted by Makima and attacked by Angel in the alley leading to the café. As she bleeds out, Reze wonders why she did not try to kill Denji when they first met and admits never having gone to school either.

In a post-credits scene, Denji holds a flower bouquet and appears depressed as Reze never showed up. Power arrives instead and asks if the flowers are a gift for her. He considers giving her the bouquet before eating it instead, causing them to squabble.