Danganronpa: The Animation Episode 4: Weekly Shounen Despair Magazine: (Not) Normal Arc

 info: MAL/wiki/AniDB

 "Following the class trial, Monokuma grants access to the second floor of the academy, containing a library and a swimming pool with gender-divided changing rooms. Whilst searching the library, the group find a broken laptop and a letter that indicates Hope's Peak Academy has actually been shut down for years, along with a storeroom filled with confidential files..."

 Another person was killed in episode 4, I'd put my money on Fukawa for being the culprit. Can't believe MC wet his bed till 5th grade. Monobear Song OP is so strange but not bad. You can also watch this episode here.