In this world where power, magic, supernatural and spells exist. Human are powerful than any other creature in this world. Human and evil monsters are enemy, human train to get stronger to defeat the evil. They teach the younger on how to use magic and the others. The gifted one is supernatural. Human form a team called "Monster Slayer" to defeat evil.

Aiden is the strongest "Monster Slayer" in the city and everyone adore him and he lost his best friend in a fight with monster. One evening, he have a party with his team when he spot someone mysterious come toward their bunker and he raise his eyebrow.

"Stop there. You're a trespasser. Who are you?" He ask in caution.