D.E.M.O.N.S: Getting Summoned Weekly isn't so Bad - Chapter 1544 - Bubbles!

After an ultimate battle against the King of Hell Lucifer, Asmodeus, the Vampire Emperor, has fallen. Although he lost, he died without regrets and with a smile, prideful that he had managed to corner the King of Hell himself to such an extent.

However, due to a sick twist of fate, Lucifer himself decided to reincarnate him into the feeble body of a human child named Blake, desiring a rematch in the future!

Now, given a new opportunity at life, Blake will use every possible way to grow stronger and protect his new family in a turbulent world where people can summon spirits to fight and develop their magical powers.

Armed with only a Grimoire, he’ll slowly summon all of his previous life subordinates, who are all powerful Vampires, and rise to the top while fighting the ever-growing menace of the Demon Towers.

Accompany Blake through a journey filled with excitement and growth and experience the rise of the Vampire Emperor. A new Era of Blood is about to begin.

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

College was like a wake-up call for most people. Especially the likes of Christopher Owen, who spent the rest of his high school years messing around and pining for the boy he never had.Having had a frustrating high school year, he decided to dedicate himself to his studies in college.He flew many miles away from home, changed his looks, and hid his real identity from everyone. His plans were simple: study hard, pass well, no dating.But then he realized two things: life was anything but easy without the backing of his last name.And... he wasn't sure how long he could last before he jumped his roommate, who was obviously not gay.But lust wasn't love, right?Maybe he could indulge a little? Just a little, I promise.

When she woke up, Lake returned to the classroom of the third year. The classmates were in class with swords and sticks, and the teacher became a female Taoist.
The little fat man in the back seat, how to put two big hammers under his chair.
Rick found this to be a global era!

- Description from Uukanshu (translated)