Nagase Mami makes her debut in Fitch! Mami, who teaches in the city, met her brother Yuzuru when she returned home. However, his expression was stiff. Later, upon hearing from their parents that Yuzuru had been a recluse, concerned Mami learned from him that he had been ridiculed for being a virgin. She decided to teach him the flow of sex so he wouldn't be nervous during his first time... Excited by the situation, Yuzuru lost control and eagerly caressed her, ultimately inserting himself inside her.
