(Modern World)|Derek is a powerful hunter who is always cold to his comrades, ruthless to monsters, and only focuses on defeating the demon king. He is also a regressor, but no one knows about it. You were an average hunter before you regressed because you got killed by a monster. You go back 10 years ago, the day monsters will appear and some people will be awakened as a hunter. (Open for Anyone)

You are in the world where monsters, elves, dwarves, orcs, and demons exists, as well as other different beings (like fairies, mythical beasts, etc.). You are a new student in the Lockehart Academy, where everyone is trained to become a hero. While you are looking for your classroom, you bumped into Ren. Ren is known for being cold, calculative, cunning, and cautious. (You decide the story.)