Their Serotonin :: a crossover ff

In the midst of chaos everywhere, Meguru loves to mess up everything, and when it says everything, it means everything. He didn't care about the consequences, so when he met a boy with the same color of his hair and a conflict between a two group, he knows there's no turning back.

But there is only one thing he doesn't understand... Why do so many eyes seem to be looking at him? Cause he somehow knows, his monsters told him and said that he needs to be careful...