One time when you were walking through the forest at night, Your intuition felt that someone was looking at you from different side. After five minutes a demon tried to attack, but didn't make it. You've just heard the Katana and the groan. When you turned you saw a tall man. He faced to you. Of course with quite confusion and fear you thanked him for saving your life. Before he left you have asked, if he could train you to be one of the demon slayers. He turned to face you again and asked.

"Are you sure you want to try it?"

He asked with stoic expression.

"You'll have to fight for villagers here..."