One day... Nana, who was spending the night at Eita's house, encountered Eita's father, Yuta, who had returned home after a long time. Yuta, who had returned home fully intending to have sex with Riko, was forced to give up due to Riko's period, which happened at the worst possible time. That night, Yuta caused a problem. Eita found out about it and used it to his advantage. Yuta reluctantly gave permission for his relationship with Riko, something he had previously forbidden. Riko fell for Eita's meticulously planned scheme. It escalated into a huge commotion, even involving Mamoru! A ghost incident broke out at school… The class representative from the neighboring class, Fuji Kiyomi, even appeared, making the situation even more chaotic.