On the way home from the grocery store, Kasumi, who has an unbearable urge to go to the bathroom, stops by the neighbor Yokoyama's house. There is no one at her house, and Kasumi eventually commits her mistake in front of her house. Witnessing her constant pouring of Kasumi's chores, Yokoyama records her appearance on her cellphone and approaches her. Yokoyama forces her surprised Kasumi into her house and rents her bathroom. Kasumi is forced to take a bath. However, after a while, Yokoyama enters her bathroom and begins to harass Kasumi, threatening her with Kasumi's mistake as an excuse. Kasumi, who has no choice but to listen to all her perverted favors from Yokoyama, falls into her unwanted pleasures.