Rin, a teacher who serves as the deputy advisor for the mountain climbing club, came to climb a mountain with his advisor, Saiji, for a preliminary survey of their summer training camp. However, during their journey, Saiji sprained his foot and was unable to descend the mountain. For Rin, who hated Saiji's malicious personality, this situation was the worst possible. After wandering around, they finally reached a mountain lodge, which turned out to be a hellish place illegally occupied by yakuza. There, Rin not only had his body tormented by the yakuza but also ended up being pinned down by Saiji…
