Seiji of the son gives the answer of the examination of the health and physical education with a blank paper, and the Reona of mother is called in Tako by a school. And Seiji cannot be yet interested in Sei, and the Reona notices the Koto which does not have the knowledge. Kazukiyo of the classmate of Seiji who knew this suggests it later when Reona and oneself practice the Sex in front of Seiji. Were Reona to be puzzled over, but when in this situation I torment it and look good with Seiji, be threatened by Kazukiyo, and decide Koto doing SEX with Kazukiyo in front of a son.
