Yukimura Kaidō lived as a ghost in his life-bullied for his feminine features, beaten until he lost an eye, and too afraid to fight back. He spent his days hiding behind a computer screen, finding courage only in the final seconds before a truck ended everything. Death should have been the end... Instead, he woke up in the Demon Slayer world. [Ding! Compatible transmission target detected. System binding initiated... Binding successful!] [Ding! Congratulations! Host has received: Body Enhancement Serum x1, Total Concentration Breathing: Constant, Dragon Breathing First Four Forms, and 100,000 Yen.]

When I awoke, I found myself in the perilous world of Demon Slayer. Bound to a mysterious system-the Ultimate Defense System! Mitsuri Kanroji murmured in awe, "His strength surpasses even mine..." Kagaya Ubuyashiki nodded in admiration, "Truly, the Demon Slayer Corps' strongest shield." Even the fearsome Kokushibo conceded, "You embody the strongest defense our generations have ever seen." Akaza acknowledged me as an equal, "To master defense to such a degree... you have become a warrior worthy of fear." And the Demon King Muzan Kibutsuji-once unshaken-finally lost his composure, "No... no living being should possess such durability!" In a world where offense reigns supreme, I chose the path of resilience. I do not wield a blade to kill. I stand to protect. No demon shall pass me. No comrade shall fall behind me. I am not the hero this world expected- I am its unbreakable shield.