Saiko no Kyoshi 1 Nen Go, Watashi wa Seito ni Sareta (2023)

- Both are in a high school setting
- Both talk about bullying
- Both have teachers trying to change their students for the better
- Both are mystery and thriller

Another drama series that deals with bullying in a high school, along with slowly destroying a rank system among the students that's common in most bullying-centric dramas. I recommend mostly for both main leads focusing on trying to change the class they are part of, plus gaining friends along the way. Though the reasons are both very different and the roles are too (one is a teacher, the other is a transfer student) I consider 35-sai a classic drama that any should watch if they enjoy dramas that focus on school bullying and the Japanese educational system.

Very similar plot.
An atypical teacher tries to change their evil students.
In Saiko no Kyoshi the teacher went back in time after her students killed her, in Ore No Sukato, the teacher is a man dressing as a women.

Both drama feature students trying to kill their teacher.
Saiko no Kyoshi is more realistic, while Sensei wo Kesu Houteishiki can be a bit over the top sometimes.

Both drama feature an adult trying to fix a messed up school.
In Saiko No Kyoshi, it's a teacher that manages to go back in time after being killed by their student, while in Ao no SP, it's a policeman assigned to work in a school.

Both drama feature school teachers trying to fix their classroom, sometimes using unconventional methods.

Both drama feature school teachers trying to fix their classroom, sometimes using unconventional methods.

Both drama feature school teachers trying to fix their classroom, sometimes using unconventional methods.

In both, a teacher is confronted with their students commiting a murder.
In Confessions, it's the teacher's daughter. She then tries to get revenge.
In Saiko No Kyoshi, it's the teacher herself, and she go back in time to prevent that.