Kio’s an ordinary high school student living in Okinawa. One day, he meets a cat-eared alien named Eris who claims to have come to Earth for an investigation. For whatever reason, Eris has decided to live with Kio and not only is she a freeloader, she seems to have brought a lot of troubles along as well… after much anticipation, this popular love comedy has finally been adapted into a manga! (Source: Global Book Walker)

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.

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.

The story revolves around Kakazu Kio, an ordinary high school freshman living in Okinawa. A girl with cat ears appears before him during a memorial service for one of his family ancestors. The girl calls herself Elis and claims she is an alien. Before long, fanatical alien worshipers and a mysterious government agency are in hot pursuit of Elis, but Kio's childhood friend Manami — who wants to follow in her father's footsteps in the CIA — captures Elis. Kio finds himself having to protect Elis from everyone. (Source: Wikipedia)