Oukoku e Tsuzuku Michi - Chapter 317: Oath Ritual

10 years ago, after “the Gate” that connected the real world with the monster world opened, some of the ordinary, everyday people received the power to hunt monsters within the Gate. They are known as “Hunters”.

A teenager named Evan Mason was reincarnated into the magical world of Harry Potter and goes to school at Hogwarts!
With only his knowledge of the future and great talent for magic, he takes the path towards the top of the magic world, only to realize that ever step he took, changed everything!

- Description from Novelupdates

Five years ago, after a car accident, Ye Fan fell from a demonic prodigy to an “idiot”!Five years later, on the same day, his seven older brothers and three uncles all perished on the battlefield, a family of ten loyal martyrs!At the funeral, Ye Fan's fiancée called off their engagement. The stunning sister-in-law declared on the spot, “If you didn't want to marry him, I will! I am willing to carry on the Ye Family line...”Ye Fan felt uneasy, “Sister-in-law, please don't. I'm really not an idiot anymore!”

Lin Zheyu transmigrates into an ancient world and becomes a storyteller to make a living. After being robbed several times, he decides to learn martial arts for self-protection.However, during one of his conversations with his master, Lin learns that this world is home not only to martial artists but also to demons.