I'm the Only One With Nothing

The day the world changed, everyone gained a game System, an inventory, stats, experience points, and everything else you could imagine. Everyone, that is, except Ember, who had nothing.

Q: So how does the protagonist get stronger?

A: By absorbing souls.

Q: Isn't that just like an Undead?

A: That's why the planned title was The Undead's Bizarre Adventure.