Yua and Ikumi, who both work part-time as cleaners due to their love of cleanliness, are good friends, but in reality, Yua is a lesbian who secretly has feelings for Ikumi... However, she never confesses her feelings, and they keep them to themselves, never going beyond the relationship of senior and junior... However, when the two go out drinking together, while taking care of Ikumi, who has fallen ill from excessive drinking, Yua is no longer able to suppress her own urges...