I Was Once the Dragon King, but Somehow Reincarnated in an Anime Crossover

I was once the Dragon King, but to my surprise, I was reincarnated into a loving family. It wasn't until the academy's trial day that I discovered I was invincible in this world, too.

Fire Dragon: "My king, you're back!"

Thunder Dragon: "We've waited a hundred years for you!"

Long Chen: "Your king has returned!"

This is a System novel, but it's even better than your typical System novel, with plenty of satisfying urban action, too.

This novel and its characters are entirely fictional. Any resemblance to actual people or events is purely coincidental. Do not imitate.