Re:Mind (2017)

Not only are the titles similar but they carry a bungee of similar aspects like
Psychology, horror, mystery, and thriller.
They both take place in a high school setting with the characters not feeling like they fit into the world around them.

Similarities:

They both have the idea of high school students being locked up somewhere before graduation. They both try to mainly discover the truth of a fellow student and reveal secrets about all the other classmates in order to find it.

Differences:

Re: mind - only 11 students and they are all girls. Focus more on the dead student. They stay in one room and the time period is around one day. Has a creepier/darker setting and mood.

Mr hiiragi’s homeroom - has the whole class and teacher (all genders). Slightly change the topic but still somewhat stay with the idea of the dead student. They stay within one floor of the school and stay there for about 10 days. Somewhat a lighter mood.

Tbh the names just looked similar.
Ig in a way maybe they are similar
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Shirome is about supernatural happenings and the acting is waaay worse (even though there's a nice meta aspect to it), but they're both about an idol group being terrorized by someone/something.