MTL - Escape From Konoha - Chapter 19 consider

This is the story of a young man who was reincarnated as a dragon with a near-insatiable curiosity. Initially sparked by questioning his own reincarnation, he quickly gets lost in the endless world of magic, using his deep understanding of advanced sciences to learn the laws and properties of a new type of energy known as mana.However, soon enough, the table would flip, and he would begin using that very same energy to expand his knowledge of science, to the point that he would begin questioning his own understanding of the world.Although not his original intention, with the combination of his intelligence, expanding curiosity, and the 'miracles' that occurred to allow for his existence, he quickly found himself climbing the mountain of strength as if it were a small hill before eventually climbing to a point where it seemed as if he himself was the peak itself.Even if.. that was never the case...There is mild gore, and profanity is 'censored' toward the beginning, but not later in the story.

Mu Xiaoke was a fool in his previous life, he and his older brother love Fu Jiayun. He is a little mute who’s a total failure, how could the other person choose him? He shouldn’t have competed with his older brother, or married Rong Yanzhe as a substitute for his older brother, otherwise he wouldn’t have died alone in the wilderness with his corpse never to be found.

God gave him a chance to be reborn. When he returned to his first year in senior high school, he knew that he could not repeat the same mistakes again. He had to stay away from his older brother, Fu Jiayun, and Rong Yanzhe. The person who treated him as a stand-in for his older brother and kept abusing him. This time, he didn’t ask for anything, as long as he could live well.

It just didn’t occur to him that when he kept a respectful distance from those people, they instead came to pester him endlessly. He was in panic and unexpectedly provoked another man who shouldn’t be approached…

- Description from Novelupdates

The most awesome thing that the timid and shy Wen Zhichu did in his life was to save two elementary school students who were crossing the road recklessly. For the first time in his life, he had successfully tried to show his bravery. In the process, he also successfully died.

When he woke up again, he found that he had transmigrated into the book as a cannon fodder villain who repeatedly kept making trouble for the protagonist, and finally because of offending the protagonist, he was forced to sleep on the streets.

Since he was a child, his mother had told him that his body was delicate.

Wen Zhichu, who couldn’t sleep on the street: !!!!!

Just when Wen Zhichu planned to not participate in the plot at all, he was accidentally bound to a villain system. If he didn’t make trouble for the protagonist according to the original plot, his money would be deducted, and he will have to go to sleep on the streets earlier than in the original novel.

Wen Zhichu: -smile-

Wen Zhichu was forced to follow the path of the villain, and every time he saw the protagonist’s strong body, his calf trembled. The protagonist’s single punch looked like it was enough to kill two Wen Zhichus.

Villain’s Mission: Destroy the protagonist’s lunch.

- Description from Novelupdates

After dying in an oddly anticlimactic vending machine accident, Kazuki Ren is reincarnated in the demon realm—not as a hero, not as a villain, but as the only human male student enrolled at the mysterious Academy of Ruin, a school where all the professors are demon lords and all the students are powerful, beautiful she-demons.Ren is told he has one task: survive.But there’s a catch. The Academy’s darkest secret is about to awaken, and Ren holds a hidden power that could either destroy the demon world... or rule it.Now surrounded by seductive demons with hidden motives, eldritch tomes, forbidden dungeons, and twisted exams, Ren must master his ability—or be consumed.Magic, mystery, danger, and temptation await in this dark academia harem fantasy.