MTL - The Most Beautiful Boy In Tokyo - Chapter 18 : Bozi Soda (bottom)

A girl who calls herself a demon appeared before a timid student named Fumio Kijima. The girl claims to be a campaign girl from the demon world and she gives him the ability to “summon a room” from nothing but thin air.

At first he doesn’t abuse his power and uses it as a convenient ability in his every day life. But one day he is bullied by his classmates under a false pretext and is made to suffer. In the past he would have wallowed in misery and cried himself to sleep, but now he had a power to call upon.

“I will make them regret it!”

Using his powers to summon his “room”, he begins his era of confinement and brainwashing to achieve his goals.

What if a wisp, with zero EQ about human culture and habits, gains the opportunity to cultivate and finally achieve human form? Now he can enter cities, experience technology, and fight his way to the top, right? In this universe where wisps are seen as nothing more than cultivation resources, a wisp stands up to challenge the wisps destiny! Not without causing a lot of misunderstandings on his way, of course…

Lin Yi failed the college entrance exams and chose a diploma mill university.

And as deserving of a diploma mill university, the first line of the admission letter read:

- Description from Novelupdates

One day, Luo Jian woke up from his sleep and found himself in a locked chamber where the door and window were all sealed. A note with a few lines written on it was tacked to the wall: “Escape from this room within an hour, otherwise, you will die.”

There is a sequel called Reincarnation Night (轮回之夜) that takes place in the same universe but has different main characters

- Description from Novelupdates