After his death from the modern world, Kane came to a world that he never knew. His eyes witnessed magic and mythical creatures, he never thought he could see. The kingdom of Grizza was in chaos because of the beasts that keep on ruining the peaceful lives of the villagers. These beasts were sent by the demon king-- the creature that all the men were afraid of. People heard it was a gigantic dragon. In order to protect their land, all men in the kingdom were forced to be adventurers as their jobs. Adventurers were beast slayers and were given rewards after fulfilling missions. They were ranked according to the missions they have already accomplished. Unfortunately, Kane was one of the low rank adventurers. No one wants to form a guild with him. Not until he accidentally drew the historical sword that the great hero of Grizza before, used to leave a scar on the demon king's chest. Kane was once a veterinarian-- a doctor of animals of the modern world. He used the skill and knowledge he had to tame the beasts rather than slaying them. And so, it led him to form a team with them. Will he be able to slay the dragon with the tamed beasts he gathered? Or will he be the reason for the kingdom's full destruction?

When death was about to take him, Grey woke up in a magical new world that he never knew existed. Enchantria-- a kingdom of chaos because of a dragon that keeps an attacking the land. He was one of the army to be deployed on a mission to slay the dragon. But things change when he found out that the dragon was also a human, a beautiful woman. She was a beautiful villainess.

Brianna loves money. And her grandfather, the head of the Imperial family, offers her all the property and money he have, in exchange of her marriage with the heir of Ayasaki clan. She declined, of course. After witnessing how rude the guy is, she swore that she will not marry him. She will never kiss the pervert Kairen Ayasaki. But then, all of it was shattered when her grandpa started to get ill. She was forced to agree with the arranged marriage. What will happen to the peace that both families always wanted, when both the heir and heiress fight almost every day? Can she keep her promise not to fall for him? Or let her heart fall even if she knew that in the end, it will only break into pieces?