An adult son sends his mother an unexpected letter with a shocking confession: he has fallen for her sexually. He regrets never fully savoring her irresistible motherly warmth while he still lived at home. Every time he sleeps with a woman in Tokyo, he longs to throw himself against his mother's curvy body instead. Only after moving away did he appreciate the familiar soundtrack of her nagging him to wake up and clean his room, the hot meals that appeared as if by magic, and the way she washed his body every day. He thanks her from the bottom of his heart for raising him so well, then announces that he plans to abstain until his next vacation and return home. Wait for me, Mom!