Kouji, raised in a single-mother household, was an affectionate and clingy boy with strong possessiveness, always seeking his mother's attention. Midori tried to encourage his independence, but she was captivated by his cuteness and often gave in to his demands. As a rule, whenever they spent time together, she wore the big panties he loved. One day, Kouji saw Midori kissing her part-time boss at work, sparking a mischievous impulse within him and intensifying his attachment to his mother beyond anything before. His actions would bring a new shift to their mother-son relationship.