The only son in a single-parent household is a timid boy who is always bullied by his friends. Worried about her son, Naho, the mother, tries to put an end to the bullying by warning his friends, but she falls into a precocious trap and underestimates him, thinking he's just a child. Before she knows it, she is taking care of the children's sexual needs. And the mother is forced to have sex with her son and cum inside him.