Makoto and Yura Onoda are newlyweds in their mid-twenties, and both are still virgins on their wedding night. Makoto's confidence outside the bedroom collapses into premature ejaculation the moment things get physical, while Yura is affectionate but insecure about her own body and inexperience. With unsolicited advice from Yura's sister Rika and Makoto's older brother Akira, the couple works through the practical, often embarrassing steps of learning to have sex with each other for the first time.