"Only for a few days when the remodeling is over ..." Kumiko agrees to let Naoto, the eldest son of the Ueda family, who lives next door, stay at home. The next day, Naoto visits the Niizawa family with Yuko, the wife of the Ueda family. Kumiko's son, Junpei, couldn't hide his joy in his life with Naoto. However, Kumiko couldn't forget a word from Yuko. That is to say that Naoto is a "virgin". Kumiko, who is curious about whether Naoto is really a virgin, takes a bold action after taking a bath.
