Chapter 1: Nightraid

Awakened Garou loses his fight to Saitama. He asks Saitama to kill him, but like a true hero, refuses. Every other hero asks Saitama to kill Garou once and for all. But luckily, the kid Tareo, helps Garou escape, but he escape through an inter dimensional portal, that who knows where it goes, so Garou's life will never the same anymore.

Quick thing, Tatsumi doesn't exist in this world so don't expect him, but there is a cliffhanger, because a character of OPM universe will come to Akame Ga Kill world apart from Garou.