The keeper of night / Baker, Kylie Lee

Half British Reaper, half Japanese Shinigami, Ren Scarborough lives a complicated life, and her Shinigami abilities lead the Reapers to shun her. Forced to flee London, she travels to Japan to embrace her powers and serve the Goddess of Death. Ren soon finds herself in another battle to prove her worth and earn the respect of the Shinigami. She embarks on a dangerous mission to eliminate three dangerous Yokai demons with the help of her half-brother Neven and an exiled Shinigami named Hiro.

"Ren Scarborough has been collecting souls in the London streets for centuries...When her failure to control her Shinigami abilities drives Ren out of London, she flees to Japan to seek the acceptance she's never gotten from her fellow Reapers. Accompanied by her younger brother, the only being on earth to care for her, Ren enters the Japanese underworld to serve the Goddess of Death, only to learn that here, too, she must prove herself worthy"--.