Rinko Nakama, a 24-year-old office worker living alone, treasures her apartment as the one place she can freely indulge her secret otaku hobbies after long workdays. Her peaceful solitude is shattered when her neighbor on the right, Haruma Usada, reacts to the noise from her anime viewing by violently banging on their shared wall. In an attempt to resolve the situation, she seeks help from the kind and gentle neighbor on her left, Akito Satsuki. Instead of a simple conversation, Haruma responds by kicking down the wall separating his room from Rinko's, and then proceeds to also destroy the wall between his own room and Akito's, physically connecting the three apartments.

The forced proximity reveals unexpected truths. The hot-headed Haruma is not merely an irritable neighbor but the creator of "Usaneko-bu," the very manga series that Rinko secretly adores. The sweet and helpful Akito is also drawn into this chaotic new living situation, completing the trio of reluctant roommates. With her secret hobby now exposed and her private sanctuary gone, Rinko finds her life turned upside down as she navigates a daily routine of heart-pounding surprises and complicated relationships with the two mysterious men next door.

The story unfolds as a romantic comedy centered on this strange "room sharing" arrangement. Key narrative arcs include the initial incident that brings the three together, Rinko's struggle to balance her professional life as an office worker with her personal life as an otaku, and the developing dynamics with each neighbor. The conflict with Haruma softens as his identity as her favorite creator comes to light, while Akito's role evolves from a mediating gentleman into a central figure in the shared domestic chaos. The ongoing series follows how Rinko copes with the complete invasion of her privacy, the boundaries that form between the three, and whether her relationships with the two men will remain purely those of neighbors forced into an unusual living situation.