User blog comment:AltertheSilverBird/Total Drama: Danganronpa Chapter 7 Class Trial/@comment-27060311-20160628171457

So the killer of this mess is sadly our poor Ibuki Mioda counterpart from TD universe Izzy :(.

Now seriously I don't think there is other person aside Brick(which I don't think it is), that can create a homemade firecracker like that, Izzy's probably the one that did it, she was probably aware of Mal and might have been his target and thanks to Anne she manage to survive a little more time, however a crucial clue on this case is the color of the shirt(Thanks for pointing out that JackofallCCtrades17). Well my vote now its for Izzy until something proves me the contrary.