[The unsung hero] Serina Usui, a member of the General Affairs Department who has always prioritized others over herself, is now free to do erotic work. She is full of a sense of security and is often talked to by many employees even when she has no business with them, but when she takes off her clothes, her "beautiful, plump, self-proclaimed F-cup breasts" are revealed... Please watch Usui's first time feeling aroused while being confused by the multi-erotic tasks that are a tradition of SOD.