Kio is a dull, good person with a boring, decent existence until he encounters a lovely, curvy cat-girl during a memorial service for one of his ancestors. He's sleeping in bed with this half-naked beauty next to him before he realizes it! Eris is a representative from the planet Catian who has come to Earth to learn more about its inhabitants. And for the duration of her visit to Earth, she's opted to set up shop at Kio's house! Unbeknownst to Kio, a number of organizations would strive to apprehend Eris in order to conceal her existence in any way possible. Worse yet, when persons close to Kio turn out to be secretly members of those organizations.