Kamino Okina

Takagami Riu graduated from middle school. All of his dreams as a normal student had vanished - he was assigned to become a student soldier "Gakuhei" and filled his life with trainings. After the hard training session, Riu was called by instructor and appointed as a "BodyGuard," demanded from a magician officer. "Why it has to be me?" Riu asked this question to himself, and what awaits for him was a cute girl that dressed weird.

With her father murdered, and her mother and sister abducted, Ason Asaki is now the leader of her land. She hunts down the person responsible for the crimes against her family only to find out he is a demon that Asaki is no match against. She is saved by Mikazuchi and Hisui who use their powers to protect her. Mikazuchi makes a contract with demons to borrow their strength and Hisui is actually a sword in human form that Mikazuchi uses to destroy evil. Mikazuchi is looking for the ten demons responsible for the destruction of his town and massacre of its people. Both sides soon realize that their fate is intertwined with each other.

Okinawa. An ordinary senior high school student, Kio, meets an alien girl who has cat ears and a tail who came to Earth so that she could learn more about it. In the end, he decides to bring her home, however, living with such a person might not be as easy as it seems for Kio! See AnimeNewsNetwork for the anime. See AnimeNewsNetwork for the OAV. Wikipedia