Shini Yasui Kōshaku Reijō to Shichi-nin no Kikōshi - Chapter 102: School Life (part three)

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

My younger brother died.And it happened inside the prestigious private school that I struggled so hard to get him into.As I was crying in despair in front of his grave,A strange man who claimed to be the student council president appeared and made an unbelievable offer.“Would you like to go back one year if you could?”He seemed like a swindler, but faced with sudden despair, I had no other choice.I grasped at this rotten lifeline and hastily made a deal with him.And surprisingly, I really did go back one year in time.Without wasting time, I immediately transferred to that problematic private school. To protect my younger brother who was still alive.But this school, the atmosphere is not right.Ghosts and spirits appear all over the school, and ‘ghost stories’ occur.Somehow, my brother seems to be connected to these strange phenomena.Will I, Melody Hastings, be able to safely solve the ghost story, protect my younger brother, and get out of this school?

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)