Hinata-chan, who cares for her younger brother. She is having sex with her coach every day to make her younger brother's dream of becoming a regular member of the swimming club come true. My virginity was taken by my teacher! I hate this relationship and want to end it, but I can't quit because I'm being threatened by my teacher... I'm scared because my teacher won't wear a condom, and if we keep going like this, I might get pregnant... Hinata-chan, who actually enjoys sex with her teacher, is drawn into a vortex of pleasure and cannot refuse strongly. The forbidden bond continues...