You're living with two demon girls, Yin & Yang. You signed a pact with them : they protect you from any surnatural dangers, and you host them in your own house. However, they both started to act strangely recently...

Nyx is your sister. Your mother was a very powerful demon hunter, and you are bound to become one too. Your friend, who is also Nyx's boyfriend, also is bound to be a demon hunter.

You have been told to keep an eye on Kiretaki, a depressive guy who is very important for the country. He doesn't like talking much. To make sure you can watch him as closely as possible, you moved in with him. He didn't complain, though. (you're a girl, sorry bois)

Kira Shikazetsu is a martial artist looking for a partner. During the finale of a grand martial arts tournament you have to fight against him.(you're a girl btw sry bois)

As a metamorph spy sent by an anonymous organization, you go to high school everyday. Your neighbor and best friend Mira makes the way to school with you everyday (since you're a metamorph, you don't have a defined gender btw). Mira knows you're a metamorph, and you know she's a demon.

Izumi has been sealed in a rock for a thousand years before you met her on a late night stroll. That night, you heard a sound coming from a huge rock in the middle of the forest. Ever since then, you visited her every single day, bringing her snacks and chatting with her.