時ノ檻～死に戻りの霊装使い、【コピー】能力で最強へと至る～

"I will definitely kill the Demon King who intends to destroy humanity. For that purpose, I’ll use anything—no matter what means it takes—" Link, who lost his precious comrades in the battle against the Demon King. Inheriting his comrades' dying wish, he delivers a desperate blow to the Demon King, but he is unable to prevent the summoning of a swarm of magical beasts, and humanity is defeated by the Demon King. However, when Link, who was supposed to be dead, wakes up, he has somehow returned to his childhood 10 years ago...!? Having returned to the past, Link resolves to defeat the Demon King using any means necessary, making full use of the knowledge and experience from his previous life!