Ourliazo

In a world full of dangerous supernatural creatures, Kyouya is simply a human. Except he's still Kyouya Hibari so everyone is terrified as he takes it upon himself to fight every type of supernatural creature there is.

It's the zombie apocalypse for about an hour, and then Hibari Kyouya happens. During his terrifyingly efficient takeover of the world, he also deigns to clear out the zombie infestation.

Kyouya is seven years old and enjoys making herbivores spontaneously combust. (In which Kyouya collects flame active children because the colours are pretty. By the time someone notices, it's already far too late.)

Something shakes the school building, the impact going through two floors and deep into the earth but leaving no hint of the object that caused it. Five students in the initial room disappear with no trace. They wake up in a different world, one far less kind, and have to fight their way through several dimensions to follow the path back home. (May thinks that if these boys could stop messing around and actually take this seriously, things would go a lot faster.)