Yuka raised her only son, Shuichi, all by herself. However, as a result of doting on her too much, Shuichi became selfish and was secretly tormenting his classmate Hajime. Afterwards, Yuka learns the truth about her and apologizes on Shuichi's behalf, but... Hajime, who is burning with revenge, is unable to forgive her and plays with her body as compensation for her revenge. That's not enough, and she approaches Shuichi, who doesn't know about her situation, and asks him to lend her his mother...