Koiro Yuki, a female college student working part-time at a convenience store, is attracted to the manager Makoto's kindness and confesses her feelings to him, but is rejected because he is married. Still, Koiro refuses to give up and uses her breasts to attack him, eventually managing to get him to have sex with her! She is told that raw sex is not allowed, so she plans to use the store's condoms for a little while, but she can't stop herself, and even when they run out of condoms, they continue having sex and become addicted to their relationship of raw creampie sex.