Mami works part-time at the same convenience store as her boyfriend. Lately, her worries have been about sex with him, and she starts to feel uncomfortable because there isn't much penetration. One day, she is found out to have sex during her break and gets scolded, but then she sees the manager's huge bulge. With a strong Kokoro for big dicks and an insatiable sexual desire, she seduces the manager and demands sex even while she is still working part-time.