Mami works at the same convenience store as her boyfriend. Her recent problem is sex with him; she's started to feel a sense of discomfort due to the lack of penetration sensation. One day, while on break, they get caught having sex and are scolded, but at that moment, she sees the manager's massive erection. With a strong curiosity for large penises and insatiable sexual desire, she relentlessly tries to seduce the store manager for sex even while working part-time.
