Sixteen-year-old Tenichi Iemori works part-time for a house cleaning service and dreams of one day building a cozy house for himself. He is content with his peaceful daily life, but as he begins his second year of high school, things start to change. Himari Yoshino, the president of a popular makeup company, transfers into his class, and Iemori is assigned to look after her for the day. After getting through the day with Yoshino, Iemori goes to clean the apartment of a new client. When he arrives, he is shocked to find the luxurious apartment in complete disarray, but what shocks him most is the resident—Yoshino! Although Yoshino is hesitant to let a classmate work for her, Iemori quickly proves his worth, leading her to entrust him with the job. And even though the two must keep their arrangement a secret to avoid unnecessary rumors, they gradually begin to feel more comfortable in each other's company.