Yusuke and Konomi have just started living together. Yusuke's coworker, Kojirou, gets fired from his part-time job and kicked out of his home, so he starts crashing at their love nest. Initially, Konomi is disgusted by the sudden houseguest, but as Yusuke becomes busier with work and is often away, Konomi finds herself talking to Kojirou more frequently, and their distance begins to close. As her birthday approaches, Konomi's frustration over not being able to see him grows, and Kojirou offers her alcohol. Konomi falls for Kojirou's smooth techniques…
