The Dragon Who Grew Up with the World-Destroying Demon Dragon

After being reincarnated, Mi'er opened his eyes in an underground labyrinth in a modern fantasy game world.

The good news: He had become the mightiest magical creature in this world, a dragon.

The bad news: He was a frail newborn hatchling.

Fortunately, he wasn't alone in the underground labyrinth. Mi'er looked at the little black dragon that had dragged him out of his eggshell, then at the name above its head: [Anseis].

Mi'er: ...

He wasn't sure how to process this.

Wasn't that the name of the demon dragon who became twisted and eventually destroyed the world in the game?!

Luckily, Mi'er had the System, which made leveling up and saving his progress easy. After teaming up with Anseis, Mi'er was constantly on edge, always convinced the whole world was out to get them.

But they fought monsters and leveled up together, grew to adulthood, and were on the verge of becoming the underground labyrinth's undisputed rulers, while his childhood-friend dragon showed no sign of turning evil.

And that's not all.

Mi'er, nervously making sure each monster was dead, shoved away the blood-smeared head nuzzling him. "Anseis! You're getting blood all over me again!"

The black-haired dragon boy pressed against him again, refusing to take no for an answer. "Mi-mi, kiss me."

Mi'er helplessly wiped Anseis's face. "What do you think about all day? Don't tell me it's kissing, cuddling, and nibbling on me."

Anseis rested his head in Mi'er's hand. The tall, fearsome apocalypse dragon looked inexplicably well-behaved. "I'm thinking I should listen to Mi-mi."

Mi'er: ...(#0-0#)

[Silver dragon bottom x black dragon top, childhood-friend dragons fight monsters, survive, and level up, with some possible base-building and an adorably clingy couple]

Theme: Treasure everything around you, no matter the circumstances. Treat it with care, and things will work out in the end.