Yuuji and Reina are living together with the intention of getting married. The two started dating after going on a company camping trip, and as a nice gesture, the company president plans a camping trip to celebrate. However, Yuuji is suddenly asked to do some work. Reina is uncontrollable when she drinks, so Yuuji is worried about her and keeps contacting her frequently, but she gradually stops answering her calls, and when he finally gets in touch with her, he notices that she is breathing heavily. "Something's wrong..." By the time Yuuji realizes this, the situation has already become irreversible.