Mika, the wife of the Matsushita family, and Yuki, the wife of the Kikuchi family, who are also neighbors and have the same circumstances as their husbands are being assigned to work alone, have always been friendly. One day, Yuki's husband collapsed, so Yuki's son, Masayuki, will be taken care of by the Matsushita family. Before leaving, Mika, who had been told by Yuki that Masayuki was a "virgin", couldn't hide her interest in Masayuki. And a few hours later, Mika will give Masayuki a lifelong unforgettable brush-writing experience ...