One Piece: Unreal Adventure - Chapter 17: This is Going To Be A Long Day

Vainqueur Knightsbane is your average dragon: a giant, fire-breathing lizard who loves to take naps on his golden hoard, kidnap princesses for fun, and make the life of adventurers miserable. Vainqueur's only pleasure in life is to watch his treasure get bigger, one coin at a time.

So when a would-be thief turned unwilling minion tells him about "classes," "levels," and "quests," Vainqueur wonders if maybe, just maybe, he should consider a career change.

After all, why bother hunting monsters for free when you can get paid for it?

Xu Yiyang, who was only late in his life when he was middle-aged, returned to 1999 in a dream.

At the turn of the millennium and the turn of the century, he realized a truth:
Not only to be famous early, to start a business and make money, but also early!
………………
New book uploads, new stories, new voyages,
Hope you all support!

- Description from Uukanshu

In a parallel world filled with pet beasts, people tame, train, evolve, and trade beasts.

TL Description: Eat The World Tree is about a strange guy, who happens to be extremely curious and unable to stop himself from acting on his curiosity. The MC makes a slight mistake and travels to another world, and must fulfill specific quest or face varying levels of consequences (normally death).