It wasn't Hinatas fault this happened. In all honesty, it was Kageyama's. If Hinata didn't get those Sea Monkeys from Kageyama, he wouldn't have put in the Miracle Grow Daichi got him. If Hinata stopped feeding them his sister's hair they wouldnt have become blood thirsty mutants. So if you were going to blame someone, it should be Kageyama. The team of Karasuno have been split up into two after the Sea Monkeys evolved and took over the world. The two teams must find each other, as well as that, they need to avoid getting attacked by the mutant Sea Monkeys. It doesn't sound that bad actually, right? Sea Monkeys can't be that dangerous. All they can do really is bite and infect the victim with a deadly virus which causes them to go out and try to find a better host which, in the end, causes everyone to become infected and kill each other. So overall, Kageyama was the one who brought the whole world to a stand still. And Hinata will stick by that.

A blender. That is literally what caused it. And a hint of magic, but what good does that get you? Take Harry Potter, his life's a mess.