Is love poison or salvation? Things like "heart" are really troublesome to deal with. Maybe there are relationships in the world that can still be maintained despite killing each other? Beneath the smiling face, a cold current of malice formed a whirlpool. Kazuo Wakui, who works as a manager at the sub-rented apartment "Sumiso", lives a small life like a family with the tenants living here. The members include OL Mi Jushou, film and drama production director Hayato, and flower shop owner Aoko. Their familiarity and friendship with each other are sometimes even better than real family members.