Gyutaro and Daki

In this universe, it's the other way around Gyutaro is a demon slayer and Daki is a demon, and when Gyutaro returned from work, he noticed that there was maintenance in the house where Daki worked. I noticed that other Oiran were killed there, as well as the manager and the samurai. And daki was the only one who came out, but she was turned into a demon, and so Gyutaro decided to м Become a demon slayer