Kio Kakazu is a kindhearted, yet sophisticated guy who is living a dull and boring life on Okinawa. One day, after attending a funeral for the death of one of his ancestors, he meets a catgirl named Eris. But unbeknownst to them, fanatical alien worshippers and mysterious organizations are in hot pursuit for Eris. To make matters worse, Kio's friends turn out to be a part of those organizations.