Suzuki and Hoshi are lovers, both working in the same company and engaged. Suzuki, wanting to focus on work, is not ready to get married yet, which often becomes a joke among 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, approaching and seducing him! It turns out that Eimi has always been interested in Suzuki, ever since knowing about his relationship with Hoshi. Eimi has been jealous and wants to win him back from his girlfriend. This trip is the perfect opportunity for Eimi. She constantly seduces Suzuki, has sex with him even when his girlfriend and others are nearby. Moreover, Eimi allows him to have unprotected sex and ejaculate inside her! Something he cannot do with his current girlfriend...