You live in a kingdom where everyone need to be careful of monsters who will always search for prey

You and your close friend–Scaramouche are one of the monsters' slayer who uses magic and strength to kill them. Even though he's your friend, he's quite afraid of you because there's a rumor about the Queen of demons who will find and use you as her new form.. and that makes everyone kind of avoiding you

..

Today, you and another 6 people including Scaramouche are walking around a forest to find someone to kill.. The Queen of demons

Everyone just staring at you from behind because they're worried about you, especially Scaramouche..The Queen of demons might suddenly take your form and possess you