Touya has spent his whole life chasing excellence and coming up empty. No matter what he attempts, talent eludes him. Everything changes when he encounters Haito, a kendo prodigy whose skills seem superhuman. She reveals her secret: the Stem of Reincarnation lets her tap into the powers of her past selves, accessing centuries of accumulated strength and knowledge. The catch is brutal and non-negotiable: each activation requires her to slit her own throat. Haito isn't just strong for personal glory. She's humanity's last line of defense against forces most people don't know exist. Now she's asking Touya to become part of her mission, to stand beside her against threats that demand the full weight of reincarnation's power. For someone who's never been special at anything, the proposition is terrifying and impossible to refuse. This is a story about finding purpose through sacrifice, about what you're willing to endure when the stakes belong to everyone. Action pulses through every episode, grounded in a supernatural system that demands real cost.