For some reason Mizuka desperately searches for the old man who knew her personal information. After seeing her off, the old man introduces himself as Mizuka's friend and is led into the house by her innocent little sister Moyane. Overwhelmed by her massive breasts, he attacks the sobbing Moyane. The clueless girl falls into pleasure for the first time! Having completely melted her mind, the old man makes a promise to meet Moyane again...!