Ota and his wife opened a convenience store, franchised from Yu's company. Each month, besides paying the staff, they also had to pay royalties to the headquarters. Recently, new stores have been continuously popping up, causing a decrease in customer traffic, and they have been facing financial difficulties. They have tried several times to negotiate a reduction in the royalty rate with the headquarters but to no avail. Ota's wife has fallen ill due to overwork, and their son is about to take entrance exams for a private school. The pressure has been weighing heavily on Ota's shoulders, and seeing the poor business situation, Yu has added even more pressure on Ota. The last straw came when Ota lost his temper and wanted to destroy this despicable, loathsome person. He continuously belittled and forced Yu to satisfy his sexual desires. With her strong sexual ability, Ota won Yu over, made her obedient, agreed to work as a store helper, spoke well to the headquarters and especially agreed to be a mistress, allowing him to have sex whenever he wanted!