At just six years old, Ametsu became a war orphan. He was soon purchased by Count Krabille and forced to serve as a living magic tool, bound by a contract that inflicts excruciating pain whenever he disobeys an order. Under this cruel arrangement, Ametsu endured a life of constant punishment, suffering unbearable pain whenever he failed to master magic. After a few years, Ametsu had become a mage powerful enough to hunt any monster. It was then that Count Krabille ordered him to assassinate Tilmi Rigurt, the eldest daughter of the Rigult Marquisate. Obeying his orders, Ametsu set out on his mission.

However, when Tilmi witnessed the magic Ametsu used in his attempt to assassinate her, her reaction was entirely unexpected. "Your magic is amazing!!" she exclaimed, expressing genuine fascination with his abilities. And that very meeting would end up changing Ametsu's entire life...