Due to an incurable disease that resulted in him having an incredibly weak heart, Katsuo had met an early yet expected death. However, despite his unfortunate circumstances, Katsuo didn't feel a single bit of regret. He lived his life to the best that he could, and he held no regrets.
By some godsend miracle, Katsuo soon finds himself awakening in a void of nothing and given a choice. A choice of a second chance at life, a chance that he will not waste.
Though, with all the craziness that this new chance at life in this new yet familiar world, including the involvement of the supernatural world. Will Katsuo be able to truly live this new the way he wanted to?
Well, at least he had a trusty system by his side!