Inyouchuu Etsu: Kairaku Henka Taimaroku  

淫妖蟲 悦 ～怪楽変化退魔録～

On one occasion, Yamato, Mikoto, and Takeru journeyed to a mountain village for monster hunter training. Despite facing numerous demanding exercises, they eventually emerged as skilled hunters. However, an unusual transformation began to affect Yamato's body. Gradually, he transformed into a monster. The group was perplexed and alarmed by this development. To save Yamato, Mikoto and Takeru exerted themselves tirelessly. What is the mystery behind Yamato's transformation? Who can put an end to it? In order to rescue Yamato, Mikoto and Takeru devoted all their energy. What is the solution to Yamato's predicament? Will anything happen to Mikoto and Takeru as a result of this?