Takuya, the son, peeps at his mother Yumi's voluptuous body from the shadows. His respect for his mother gradually warps into a desire to possess her as a woman, which he can no longer suppress. 'This is a present for you, Mom.' One day, Takuya attacks Yumi and fits a chastity belt on her crotch. 'From now on, I'll manage Mom's sex drive.' Unable to consult with her beloved husband, Yumi's mounting desire eventually reaches its limit...
