Ryo has always been jealous of his best friend because he has a very cute girlfriend. One time, while visiting his friend's house to drink, Ryo discovered Amin's habit of placing the coaster on top of his glass, a habit typical of hostesses (girls who work in Kyabakura bars) to entertain men. When his friend went on a business trip for three days, taking advantage of Amin's weakness, Ryo forced Amin to have sex with him. Because Amin's boyfriend has very poor sexual stamina and often finishes quickly, Amin was won over by Ryo's sexual abilities, to the extent that she even took the initiative to want to have sex, even with her boyfriend watching everything...