Yuika is a middle school girl who can't even speak to boys, but who actually has a perverted heart. One day, a demon named Kebes, who is said to make her naughty dreams come true, appears before her and says he will support her in her perverted life. From that day on, Yuika's daily life changes dramatically, involving the handsome men around her and other "Kebes users." (Source: Natalie, translated)

Nakagawa owns 10 cats in real life, and she adores one in particular named Mamitasu, the anime's namesake. The anime depicts the slapstick comedy of the idiosyncratic 10 cats and the folks in the unusual "Nakagawa family."