ichika, the eldest of four siblings, helped her working parents with housework and used her skills to become a dispatch staff for a housekeeping service. Tamawa was the first customer to request ichika after she joined the company, and has since been a regular client requesting her services. however, tamawa's true intention was not for housekeeping, but for her body. "is she the next target?" said oshima, who came disguised as a visitor, a bondage maniac.