MTL - Invincible Leveling King - ~ rest for a day

Noan transmigrated to a world that blends advanced technology and magic, with countless gates leading to other strange worlds.In that world, he took over the body of a young man of the same name who had just died.He realised that in this world, he was one of the 0.1% of the population who had the ability to become a landlord and had the right to go to mysterious lands to build territories.However, he was only a Rank F lord, the lowest and weakest rank in the landlord rankings.Besides, his family was like blood-sucking demons. Not only did he wear out his labour, but his younger brother was also jealous of him becoming a landlord, so he hired thugs to beat him to death.Fortunately, the 'old Noan' died, giving the 'new Noan' a body to live again.This Noan was not a coward; he was not weak like the 'old Noan'.And of course, the goddess of luck smiled upon him. Although he is only a Rank F Landlord, who can only summon useless Skeletons, he possesses the only Rank SSS talent in the world - Almighty Fusion.He can fuse ordinary skeletons and transform them into the King of the Undead, the lord of hell.He can help a weak succubus become the almighty fallen angel.He can turn a small lizard into the King of Dragons, the nightmare of all creatures.Besides, Noan also begins to lift the curtain that has hidden the truth about the new lands.

Legend says, that there is a great demon, who is the human kind’s public enemy. He is the galaxy federations’ nightmare as he wanted to conquer the whole universe. On the first day, he completely took out the human fleet, plunging them into disorder. On the second day, he declared that he will wipe out the whole federation. On the third day, he declared——that the hero who shot him in their previous battle must marry him, or else, he will destroy everything.

The galaxy federation president and the council members had a long meeting after that. They decided to dispatch a soldier, Wu Xing Yun, and marries him off to the arrogant demon. Wu Xing Yun was once a hero who fought for the nebula, and henceforth, he was tasked—— for the sake human race and the universe’s peace, to eliminate mistresses, settle his matters with the mother-in-law, and fix the man’s crooked ways.

Wu Xing Yun was very perplexed when he asked his commanding officer: “Sir, why did it have to be this way?”

Commanding Officer: “Soldier, bear in mind, that this mission of yours, is for the sake of the universe and mankind’s happiness. You must hold on to your husband, and fight other mistresses! Do you have the confidence to accomplish this task?”

Wu Xing Yun, stood straight, saluted, and instinctively replied: “Sir, yes sir! I will accomplish this task!”

- Description from Novelupdates

A god of a different world had abruptly appeared in my classroom and semi-forcibly summoned the entire class to his world.ーーーーexcept for me, Kamiya Yato.

He became a teacher at the best magic academy in the empire.
….For being mistaken for someone else.