New nurse Umi is assigned to take care of an elderly patient at home. Initially, the old man was senile, but upon seeing Umi's young and attractive appearance, his dormant male instincts awoke, leading him to repeatedly perform actions bordering on sexual harassment. Furthermore, taking advantage of Umi's lowered guard as she dismisses the old man's mischief as mere loneliness, he assaults her. With slow, lingering sex, he drives Umi mad with lust, rendering her unable to resist. In this state, he continues to ejaculate inside her repeatedly until his insatiable sexual desire is sated.
