Shinji, who was dumped by his girlfriend for the first time because he couldn't remove his bra, distrusts women.One day, Shinji saw her SEX strategy book and was secretly practicing in her sister-in-law, Nanami's bra.She regains her confidence little by little, and Shinji comes to notice Nanami, who shakes her big tits and does her housework.Lack of practice! !Then, she sees Shinji depressed again, and in order to cheer her up, she buys Shinji's front-hook bra online.