I feel like this manga has a shared universe with the authors other manga Onizuka-chan. Even though this one is basically ghosts and yokai. I feel like the setting is another part of a supernatural Japan. It's sad this one is ending. But at least I can keep reading the other one.
At first, I was assuming its some shoujo-ai manga. I thought they were both women and the younger one was masquerading as a boy. I guess I was wrong. Still an interesting read and I'll follow it to See what happens next