Danganronpa: The Animation

The story takes place at Hope's Peak Academy, an illustrious private school that only accepts "super" students: the best of the best of the best. The criteria extends to any niche, so in addition to super-geniuses and super-athletes, they take super-idols, gang leaders, and geeks. Makoto Naegi, the protagonist, is still baffled as to how he got in, as his only outstanding trait seems to be his super "good" luck - and that's only because he was randomly chosen to be accepted by the school. In fact, he hasn't even started his first day of school when he suddenly loses consciousness and wakes up in a creepy alternate version of the academy.
It's soon revealed that Naegi and fourteen other new students have all been abducted by a sadistic teddy bear named Monobear, who refuses to let them leave. The only way out of the locked-down dark school is to graduate...by killing another student. Once a murder is committed, Monobear holds a trial so that the class can try to figure out which one of them is the culprit, culminating in a vote. If they make the right choice, the murderer will be messily executed. Make the wrong choice, and not only does the murderer escape, but the rest of them will take the punishment in their place...