My Straight-Laced Virgin Boyfriend is Way Too Big! Will It Even Fit...?

Synopsis

Chisato has been dating her college classmate Keitaro for over a year. While he's smart, serious, and the perfect boyfriend, there's one thing bothering her: they haven't gone beyond kissing. Chisato feels anxious about their overly platonic relationship, which feels more like an old married couple. Determined to change things, she plans a hot spring trip. She's ready with smooth skin and sexy lingerie. But even in bed, Keitaro remains cold and turns his back to her. Unable to take it anymore, Chisato tearfully asks, "Don't you see me that way?" Keitaro finally opens up. The reason he couldn't cross the line was his fear of being rejected if he wasn't good enough, and a "secret" about his body that is completely off the charts. Surprised but supportive, Chisato tells him she could never hate him for that. Finally, the walls come down, and they prepare for their first night. However, the "reality" she sees is beyond anything she imagined. "Wait... is that really going to fit?" Amidst a mix of anticipation and anxiety, a sweet and intense first time with her serious boyfriend is about to begin.