Naruto: The Outsider's Resolve - Chapter 1.6 (016):

The most precious things in the world are priceless. Ordinary men tend to turn a blind eye to this fact. Apart from the treasured air, sunlight, and familial love, there is still one more thing that’s extremely valuable. It’s right beside you and can be easily obtained. But… I wonder whether you can see it?

In a world where Taming Beasts determine strength and destiny, Leonhardt Valtara is reborn as the heir of the most feared villainous family in history. The Valtaras are ruthless, powerful, and utterly devoted to their own—especially to Leonhardt, their beloved son.But his greatest surprise?He is married to Celestia Nightshade—the Number One Villain, a peerless beauty, and the most genius Taming Beast Master of her generation. Feared by the world, Celestia wields unmatched power, yet behind closed doors, she is the most doting wife, willing to burn kingdoms if it means protecting Leonhardt.However, fate has already written his downfall.The original protagonist, Rael Ascarion, a rising hero, is destined to gather allies, defeat the villains, and restore “justice.” By his side is Evelyn Astralis, the heroine meant to love him. According to the original story, Leonhardt and Celestia are fated to lose.But why should he follow a script that leads to his destruction?With his reincarnated knowledge, Celestia’s overwhelming power, and his first beast, Ironhorn, the Indomitable Rhino, Leonhardt will crush fate itself and carve his own path.If the world wants him to be a villain…Then he will become the greatest villain of all time.

One day, I woke up only find out that I’d become a Demon Lord, an individual responsible for protecting a dungeon. The world I’d been spirited away to was one filled with violence. Gigantic monsters wandered through it and competed with each other each and every day for the right to survive. I had no choice but to strengthen my dungeon’s defenses in hopes of living another day—or at least that was what I’d thought. For some odd reason, I instead ended up spending my days in relaxation and bliss.