Kyosuke the Apostate, as they call him in the yokai world, has returned to Japan. Fifty years have gone by since the death of his beloved Masaki. By coincidence or due to destiny, he unexpectedly saves a young girl from the hands of a group of shady individuals. In that moment, he realises that the scent of this girl is the same as the one that Masaki had. Now he has to protect that girl. And in order to do that, he has to confront his past. He will do anything to learn just one thing. Who is this girl and what is her connection with Masaki?