I alone Level Up! [Gamer/Highschool of the Dead, World-Hopping]

To the world, the End happened suddenly. The Undead prowled the streets, while concepts such as Order was gone with it. In times like this, many will fall, but some... Some will rise. Ding! Congratulations Gamer, you have Leveled Up. Meanwhile, He inventoried his gun and smiled. Gamer OC/ Superpowers AU (World- Hopping, Multi-Cross)