When his mother, Mako, learns that her son, Naoya, is being bullied by his friend, Kenji, she warns Kenji. - However, Kenji instead begins to threaten Mako, saying, ``I won't bully Naoya if my aunt is my partner for sex.'' - Mako resists, but thinking about Naoya, she has no choice but to accept Kenji. - Naoya secretly witnesses the whole story... - Lacking courage, Naoya was unable to stop the attack and could only watch.