Disaster Level

Disaster Level (災害レベル, Saigai Reberu) is an extra chapter included with Volume 13.

Summary
After Saitama saved a street food vendor from a monster the vender thanks Saitama and asks about the disaster levels. Saitama simply didn't know and instead asked for a baked potato. Shortly after a monster alert is announced about a tiger level threat, but the monster was quickly disposed off by Air and the alert informed the citizens about it.

Meanwhile the Surly Brothers defeat a demon level monster and receive a report of a wolf-level threat. The brother encounter Withered Sprout, a weak looking monster that begs for mercy. Angry Man tries to kill it, but was frozen by the monster. Soon after Crying Man and Smile Man were all frozen when the monster was revealed to by a dragon-level threat. Saitama later passes by and the monster uses a sneak-attack and freezes Saitama. Saitama easily breaks his glaciers, and attacks him again only to be killed by Saitama's punch, for freezing his potato.

Saitama later meets Genos, who was burning a pile of monster corpses and explains he got damaged by a demon-level monster, but Saitama was simply trying to roast his potato.

Chapter Notes

 * The chapter explains the disaster level system and monster ranking.
 * It doesn't explain how strong the average Dragon and God level threats are.
 * This special takes place in between the King Arc and the Garou Introduction Arc, as Saitama is rank 33 at this point.