《Danganronpa》 left a deep impression on me.
Let me set the stage for Dongan Rampa's 5th class trial. It's for the murder of Mukuro Ikusaba. During the investigation, everyone is present except for Kyoko, who's mysteriously gone missing. Heck, at first, everyone assumed the victim was Kyoko because no one really knew about Mukro aside from Makoto and Kyoko. And the body had a mask on it, which exploded the moment it got ripped off.
So there was no checking the face to see who it was. But anyway, all the evidence found that the crime scene points to the killer being Kioko. And not only that, but the mode of lines up perfectly too, because she's under the impression that Mukaro is the one pulling the strings to this killing game. So she would have plenty of reason to go after her. And not only that, but she's the only one other than Makoto who doesn't have an alibi.