Mao | GOGOAnime

Synopsis:

Nanuka goes through a door in the Daishou era, where the exorcist Mau reluctantly rescues the neck of the youkai. When he returned to the present, he realized he had new powers. He goes back in time looking for answers, but not in Mao’s investigation into the horrors of the murders. As her questions about herself multiply, Nanuka discovers that Mao is cursed by a dog dragon named Byoki, as is his sword. Anyone other than Mao who tries to use it will be killed. But when Mao’s life is threatened, Nanuka takes his sword and attacks him!