The Reason the Guide Apologizes

21st century South Korea, where monsters and rifts appear all across the globe. Hee-jae is both an Esper and a Guide, but he lives his life hiding the fact that he is a 'Multi-Ability User.' Eventually, he is kidnapped by S-class Espers, who suck him dry to the very marrow with their demands for guiding. Then, along with the Great Rift, the world meets its end... Since the world was ruined anyway, he thought closing his eyes would finally bring him peace. But instead, he regresses to the age of 8, just before his first participation in a rift raid. Since things have turned out this way, he decides to find those S-class Espers—who are destined to be broken while being forced into nothing...