A textbook shkolnik-orphan Takumi Tsuzuki with a summary elder sister Otome live alone and somehow managed to confectionery "Stray cat". As expected, the cats in the house is full, so confusing to them a little, and laborer Takumi helps childhood friend Fumino Serizawa, a very active and stubborn person. The boys attend the academy together Umenomori where,apart from his own company, constantly intersect with local "princess" TISE, granddaughter of the school principal, who has designs on the poor guy, but considers Fumino friend-rival. So to life and rolled on, but TISE Takumi said in class recruit a team for cosplay, all tightly quarrel, and then there was a trouble - someone ate the cake,ordered to "Stray Cat" regular customer. The only witness, baby-grader, claimed it made a cat, only very large. Subsequent espresso investigation interrogation, chases and ambushes allowed Tsuzuki family added a new character named Nozomi - whether the girl, and the truth is... a cat. To find out,heroes and we have come a series! ranobe Mayoi Neko Overrun! from Matsu Tomohiro.