Kyou Kara, Hito zu Mansion ni Nyuukyoshimasu.

Sachiya is an unremarkable salaryman whose life takes an unexpected turn when he moves into a new apartment building. He soon discovers a peculiar detail about his living situation: every other resident is a married woman whose husband is frequently away for work, leaving Sachiya as the sole male occupant of the entire complex. Recognizing his presence as a rare convenience, the women naturally begin approaching him for assistance with heavy household chores that require physical strength. In exchange for his reliable help, they shower him with gratitude, offering home-cooked meals and thoughtful gifts that make his daily life far more comfortable. This wholesome arrangement shifts dramatically when his neighbor, Nonoka, accidentally uncovers a private truth about Sachiya—namely, that he possesses an exceptionally high libido requiring frequent release throughout the day. Word of this discovery quietly spreads among the residents. The women of the apartment complex, left lonely and sexually frustrated by their husbands' prolonged absences, soon begin approaching Sachiya once again. However, the favors they request are no longer limited to moving furniture or carrying groceries, as they start asking him for a very different kind of personal assistance.