Hoshina, a salaryman, has been cohabiting with his companion Atsushi, who works as a model, and sharing a bed with him. Despite Atsushi's tendencies to clean, cook, and commemorate every important date, Hoshina remains clueless about their "arrangement." However, when Hoshina's younger brother comes to stay with them for a while, the duo must endure his presence. Will Hoshina be affected by his brother's visit, leading to significant changes in their association? Moreover, who will be the one demanding for more than just one night?
