The Battling Angel (2003)
Original title: 天使の牙B.T.A.
The Battling Angel is a 2003 Japanese-language action movie directed by Ryo Nishimura, with a running time of 1h 59m. It stars Takao Osawa, Mayumi Sada and Tomoka Kurotani.
Police struggle to uncover Klein, a powerful criminal organization. Asuka, a young detective, is assigned to contact and escort Hatsumi, a mistress of the drug lord Kimikuni, but they are ambushed, leaving Hatsumi brain-dead and Asuka near to death. However, the police concoct a top-secret plan to infiltrate Klein by transplanting Asuka's brain into Hatsumi's body.