Suzuki and Hoshi are lovers, both work in the same company and are engaged. Because Suzuki wants to focus on work, he is not ready to get married yet, which often leads to teasing from colleagues. This time, he and Hoshi, along with everyone in the company, went on a trip to improve their professional skills. However, on the first night, department head Eimi tried to be alone with him, approached him, and seduced him! It turns out that the department head has always had an eye on Suzuki. Since knowing about his relationship with Hoshi, Eimi has been jealous and wants to take him back from his girlfriend. This trip is the perfect opportunity for Eimi. She continuously seduces Suzuki, has sex with him even when his girlfriend and others are nearby. In particular, Eimi allows him to have unprotected sex and ejaculate inside her! Something he cannot do with his current girlfriend...