He is the Legendary Hero

A demon lives near the hut where Akira and his classmates live - about as legend says. In order for Akira to see the frightened look on Kazuya's face that never fears such things, it was suggested to come and test his mettle. As they wandered through the forest, Akira didn't expect anything so serious to happen. However, the more time they spent inside, the more he realised that something wasn't right. The more he realises that the reality behind the legend is actually a real-life nightmare.