Yui is a vocational school student who works part-time as a cleaner and is shy, so she rarely talks or interacts with people. You can't tell from her clothes, but she has a nice body with G-cup breasts, a slim waist, and a big ass. When her coworkers and coworkers find out about her big breasts, they take advantage of her quiet nature and the fact that she won't say no, and they force themselves on her, playing with her sexy body as they please.