Over the Top "Theory" to cover for multiple ahoges:

You (as Kaede) are the first killer, perspective change to Detective midway through Class Trial. Detective dies in Chapter 2, perspective switch to Hopebot. He is killed in Chapter 5 and you switch to Inventor Girl, who created him and "murdered" him by using a deactivation code. Inventor Girl is punished on the class trial and you switch to glasses girl where in Chapter 6 you discover glasses girl is the mastermind and then you switch to ??? who kills her and gets off the school because you manage to lie. You play as the remaining Ahoges in the secret Chapter -1.



I do think you'll be playing as the guilty party in the game though, even if only for a bit.