I'm looking for a novel, but I've forgotten its name.

It was a fantasy where the protagonist traveled to another world. The general plot: A teacher in a school in another world. The class he taught was the worst in the school. I remember that during the enrollment, the protagonist fought with two students on the field. As a result, the two students lost, and the protagonist was still injured.
It seems that the class they taught ended up with something called the Mad Demon Squad
Who knows what the name of this novel is? Tell me, thank you.
Not the Heavenly Demon God Tan
I remember that when the protagonist was teaching students, there was no training ground. Then, the principal seemed to have found a training ground for the protagonist. The training ground seemed to be quite mysterious, and the protagonist met a woman in the training ground and was imprisoned in a place. I'll think about the rest and then add.
It had been a long time, and she had forgotten the name of the main character…I remember that when the protagonist trained the students, he asked them to practice physical training such as long-distance running. He said that if they couldn't finish running, they wouldn't be given food at night.
Then, at night, when he went to bed, there was always the sound of his stomach growling. Slowly, the students became more and more serious. Then, the protagonist said,"I can no longer hear the sound of his stomach growling."
I was speechless, I continued to add. Not a professor of magic. For some reason, the protagonist had a fight with a teacher from another class. The teacher was a woman. And it was very beautiful.
Later, the class taught by the protagonist was awesome. The protagonist gave the students a Mad Demon Squad (like this one). They also went to the battlefield. The protagonist took the students to fight against the undead (like fighting against the undead).
That's all I can remember. I'll go back and think about it slowly, and then add.

Answer 1

I recommend the two books," Divinity Attraction Record " and " If Love Forgets ", to you. Although you have forgotten the names of the novels, the main character of " Divinity Attraction Record " has also forgotten himself. Perhaps you will like this type of storyline. " If Love Forgets " was a modern aristocratic novel. It described a love story between the protagonists who did not remember each other's past. It might move you. I hope you like my recommendation.