Prologue

Two chemists test out lighting a powder on fire, unknowingly setting off an explosion, their bodies fall to the floor, yet their souls find new bodies. They wake up again, in a new world, a different set of rules, and a second chance at life. Will they break away from their past lives, or will they suffocate under their weight.

Disclaimer
I only take credit for the OC, Kenja no Mago, and all of the copyrighted sources belong to their rightful creators and owners.