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Seven copper coins, which cannot even afford a bowl of noodles - this is the medal that the adventurer Eric, who once shed his blood to end the Demon King, received in peacetime. Five years ago, the legendary brave Celestia ended the Demon King at the cost of her life, and also personally rescued the dying Eric and his only remaining relative, his cousin Isadora, from the Demon King's army cadres. Eric, who witnessed the near-annihilation of the Hornblit clan, clutched the blood-stained badge and swore to become the strongest man who could surpass Celestia and protect everything! However, the Demon King is dead and the world no longer needs adventurers. The former hero has become a laughing stock, and even food has become a luxury. Living in his cousin's weird and cozy "Black Cat and Clockwork" cafe, Eric's vows seem to be incompatible with this peaceful and prosperous age... But peace is just a fragile illusion. The descendants of the Demon King, the remnants of the stubborn demon clan, and the revival of demons have quietly spread under the curtain of the prosperous age. When the dreams of the past are crushed by reality, and when the protected things are once again threatened, how will Eric Hornblit, this adventurer abandoned by the times, pick up his fallen dreams, hold the sword of oath, and embark on the road to transcend legend? Not only does he want to regain the dignity of existence, but he also wants to carve out a true path of protection in this beautiful and collapsed world!