A second-year high school student named Tenichi Iemori works part-time as a house cleaner to help support his family while his father lives elsewhere for work. He is diligent, responsible, and dreams of one day building a cozy home for himself. His relatively peaceful life takes an unexpected turn when a glamorous new student, Himari Yoshino, transfers into his class. Himari is not just a popular model and influencer but also the president of her own successful makeup line, Hima Riz. Despite her fame, Himari struggles with keeping her personal living space tidy, a stark contrast to her flawless public image.

The connection between Tenichi and Himari deepens when he arrives at a new cleaning job only to discover that the client is none other than Himari herself. Her luxurious apartment is in a state of complete disarray, and she is embarrassed to have a classmate witness her secret slovenly side. Tenichi proves his professional skill and trustworthiness, and Himari reluctantly agrees to hire him as her regular cleaner. The two agree to keep their employer-employee arrangement a secret from their schoolmates to avoid unwanted rumors and scrutiny.

As they navigate this dual life, their relationship gradually evolves beyond a simple business transaction. The initial narrative arcs establish this secret dynamic. The introduction arc shows how Tenichi is assigned to be Himari's guide on her first day, followed by the shocking discovery that she is his new client. Early chapters focus on the two learning to work together, including a secret meeting arc where they must shop for cleaning supplies without being recognized.

The story expands to include a wider circle of friends and romantic interests. A prominent character is Honoka Kanai, Tenichi's kind and supportive classmate who also serves as a class representative. Tenichi has harbored a crush on Honoka since middle school, a fact that becomes a central point of romantic tension. Honoka, in turn, develops feelings for Tenichi, leading to a date arc where she invites him to a show. This creates a love triangle as Himari begins to realize her own growing affection for the dependable Tenichi, who remains largely oblivious to her feelings while focused on his duties and his crush on Honoka.

The cast further expands with the introduction of Kanna Aizawa, a younger model from the same agency as Himari. Kanna initially visits Tokyo for work, leading to an arc where she stays with Himari and gets to know Tenichi. Her role grows significantly when she decides to move to Tokyo and transfer to the same high school as a first-year student, adding a new energetic presence to the group and developing her own playful interest in Tenichi.

As the series progresses, the narrative follows a seasonal structure typical of high school romantic comedies. Notable arcs include a school camping trip that involves hiking, stargazing, and group activities, bringing the main characters closer together. The summer break arc is a major story segment focusing on beach outings, festivals, and fireworks, during which Himari begins to consciously recognize her changing feelings for Tenichi. Other significant arcs cover events like midterm exams, the cultural festival during the new term, and winter break, where romantic tensions escalate as different characters make their moves.

The story also introduces Nonoka Himeno, a former idol who becomes the new assistant homeroom teacher and Tenichi's neighbor. Their meeting sparks the Himenono arc, where she asks Tenichi to keep her past identity a secret and later offers him romantic advice based on her own experiences. Through these interconnected storylines involving cleaning, school events, and hidden identities, the manga explores themes of domesticity, personal growth, and the complicated nature of young love.