The battle in the royal capital goes into overdrive! Does the appearance of an enormous undead monster with superhuman strength mean the end of the line for Yuki?!

After rescuing the king, Yuki and company charge headfirst into a battle against the enemy's main forces! Just when he thinks he's facing off against the prince, the apparent mastermind of the upheaval, he detects something strange in his eyes—the presence of a shadowy figure pulling the strings behind the scenes? The villain summons a massive undead creature, and it's one that boasts a terrifying regenerative ability. How the heck is a demon lord supposed to fight a mess like that?!

Back home in the dungeon, Lefi grapples with her growing feelings for Yuki, and his beloved greatsword has a surprise in store for him too. What other adventures await this reincarnated demon lord?!