Empress of Time by Kylie Lee Baker

They had come here expecting to find a runaway orphan, but I would show them a goddess.

Half British Reaper, half Japanese Shinigami Ren Scarborough is no longer the girl who was chased out of England — she is the Goddess of Death ruling Japan’s underworld. But her problems have never been greater. Her Shinigami see her as a foreigner on the throne. Her brother, Neven, is gone, lost in the deep darkness. And her fiancé, Hiro, has been killed by her own hand.

Then Ren receives the most troubling news yet — Reapers have been spotted in Japan, and it’s only a matter of time before Ivy, now Britain’s Death Goddess, comes to claim her revenge.

Ren’s last hope is to appeal to the god of storms and seas, who can turn the tides to send Ivy’s ship away from Japan’s shores. But he’ll help Ren only if she finds a sword lost thousands of years ago — an impossible demand.

Together with the moon god Tsukuyomi, who shares an uncanny resemblance to his brother Hiro, Ren ventures across the country in a race against time. As her journey thrusts her into the middle of scheming gods and dangerous Yokai demons, Ren will have to learn who she can truly trust — and the fate of Japan hangs in the balance.