Tensei Shitara Slime Datta Ken (WN) - Chapter 351

Every drop of this family bloodline is stained with sin. They are the embodiment of contradiction; calm yet maniacal, with great memories yet often forgetful. They pledge themselves to their dreams yet often compromise, are angels that are also devils… It’s why I hate them. And also love them.

The only hope of his family, a youth with the blood of elves and devils walks on a battleground of annihilation and rebirth. He wills his way through boiling lava and icy depths, killing on this field of despair to strike down the lofty figure in his sight. One day he’ll grasp his blade tightly and survey his surroundings, only to find no more enemies to kill.

It has been more than ten years since he was transported to another world. The protagonist Deris Fahrenheit, who has became a magician with special circumstances, was freely enjoying his life in this world. However, a girl appeared before him and asked him to make her his disciple. That girl seems to be a transported person――

It’s a story of him who becomes the girl’s teacher and trains her to achieve her revenge (?) in otherworld.

When my whole class got summoned to another world, I was the only one to encounter a divine being on my way over.And when everyone started getting Systems that were to define their fates?I've got an FFF-Rank Failure System.And to make matters even worse, it bugged out as it attempted to launch, teleporting me to the centermost point of the world, right where the strongests of the monsters resided.Right into the lap of a Tyrant's Puma!But what's with that sparkling glinter in the distance, that comes bearing down the weight of our shared destiny?And who's looking down on a chessboard, smiling as the pieces are starting to move.The divine intervenes. The ancient prophercies finds fulfillment.The purpose long gone awakens as the universe's destiny weaves itself into the fate of the two entangled souls.

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)