Ordinary janitor Harper is detained by a special supernatural agency after massive abnormal energy surges are detected at his rental. He appears to have zero combat aptitude on scans, yet every spatial rift monster collapses mysteriously whenever he falls asleep, entering rule-based dream realms to resolve crisis. While working as a base cleaner, he crosses paths with elite S-class ability user Ivy and sharp captain Bella. Gradually, buried secrets surface: Harper is humanity’s top S-rank weapon who sealed a world-ending polar rift two years ago, losing most memories and powers in the process. Trapped in an endless loop of dream rifts, he fights shadow fragments of his own power and the ancient god behind all cracks. After closing every rift across the globe, he finally returns to peaceful ordinary life without endless life-or-death missions.
