Ashes, Ashes

It is a well-known fact that there are heroes across the globe- and Japan is no different. They may operate under different laws and regulations than the rest of the world, but heroes and villains are common on every continent: whether they possess powers or not. When the Avengers, widely known to the world for their cross-continental missions, leave to fight Thanos, the rest of the human population is left with confusion as to their whereabouts and mission details.

Then, people start to disintegrate.

Watching their loved ones turn to dust right before their eyes is enough to bring any society together. Japan convenes as the world's governments try to find a way to combat the mess that has become their lives. The students in Class 3-A have to find a way to support each other in their final year of schooling when their education is brought to an abrupt, screening halt with the disappearance of many of their classmates. But how are they to stay strong in the face of such a despairing time?

A.k.a. how the rest of the world deals with the aftermath of Thanos's snap. My Hero Academia AU style.