Side Story 1.0

The sudden appearances of the dungeons on Earth brought a lot of panic from all over the globe. Some officials even tried to revolt against other countries or create trouble this was all subdued when the International Hero Organization was created.

Usui, who was later known as the Flame Emperor, was enjoying his time on his balcony, reading a history book when the event happened. No matter whom or where, every person on Earth experienced an earthquake with a magnitude of 9.8. Surprisingly, there were zero deaths and no buildings fall which dumbfounded several scientists who later claimed that it wasn't an earthquake but something more mysterious.