High schooler Haruki Niina lives with his novelist father and the family housekeeper, Junpei, whom Haruki regards as an older brother. The three share a quiet, peaceful household, but beneath the surface lies a hidden truth: Junpei and Haruki's father are secretly involved in a romantic relationship that they have kept from Haruki. The story unfolds as a pure boys' love romance between the taciturn novelist and his shy, muscular housekeeper, exploring the tension between the domestic facade and the concealed intimacy that binds the two adults. As Haruki remains unaware of their bond, the narrative focuses on the delicate complexity of a love that must stay hidden within the same home.