Working as a part-timer at a convenience store, she hasn't had a boyfriend for about half a year, but has two regular sex partners. She's been curious about trying threesome sex as a new experience. Without telling her beforehand, another staff member is quickly called over, and while filming their sex, they suddenly initiate a threesome. At first she looks surprised, but she quickly gets into an erotic mood with the other staff member too. This becomes her first ever threesome experience.