Dragon Raja: Mechanical Dragons Are Weak? Ever Seen a Star-Destroying Cannon?

New book: [Me, With a Lucky-Koi Constitution! I Stumble and Wipe Out a Sect!]

[Mecha + dragon clan + Eastern dragons as combatants. After awakening a mechanical dragon that can't grow stronger, the protagonist suffers endless injustice. His family disowns him, his fiancee abandons him, and even his school rejects him, sending him off to a small village to fend for himself. During a trial after coming of age, he finds a way to increase his mechanical dragon's strength: make his opponents afraid, and it grows stronger. With power-ups that feel like cheating, he pilots a gigantic mechanical dragon mech and gives everyone who looked down on him a thorough thrashing. As for the outside forces, his feats of tearing planets apart with his bare hands and destroying one planet with every shot leave them trembling in fear.]