PTA President visits the home of Koko-chan, a notorious troublemaker at school. Growing up in a single-parent household without a mother's love, Koko has lacked affection. Learning this, the PTA President, moved by compassion, decides to care for him when his father goes on an extended business trip. As Koko experiences the President's kindness, his mischievous nature and hidden desires grow stronger each day, leading him to repeatedly act out sexually under various pretexts.