Danganronpa: The Animation - Season 1 Episode 2

As Makoto tries to grow accustomed to the situation, he learns from Monokuma about the faulty door on his shower room. Afterwards, Sayaka comes to Makoto's room, saying she is afraid that someone may be after her, so Makoto offers to switch rooms with her to put her at ease. The next day, however, Makoto discovers his room in a mess and is horrified to find Sayaka lying dead in the shower room, having been stabbed in the stomach with a kitchen knife. As Makoto becomes angered by this tragic turn of events, Monokuma explains that one of the students is responsible for her murder and they must judge for themselves who the killer is in a "class trial". If the guilty culprit is successfully deduced, that person will be executed, but if they accuse the wrong person, then the culprit will get to escape the academy whilst everyone else will be put to death.