I don't see the Danaganronpa comparison honestly.
The only thing the two games share it the concept of being locked up in a school which I won't say is enough to warrant the comparison.
If I have to compare this game to something it would be 999: nine person, nine doors , nine hours if I'm remembering the name correctly
It's a pretty old game on the nintendo 3DS system but it's the closest thing I played to this game
The heroine in that game even reminds me of the heroine in this game
Their sprites look different though