Lucky Knight Custard-kun

Custard pudding, a descendant of the pudding family that has served the dessert royal family for generations.
He becomes a follower of Princess Choco Pa, who is a villainous princess.
He's extremely unlucky and gets the worst treatment for being the main character.
The princess destroyed his sword and handed him a dagger with a self-destruct device. His loyalty is real and he continues to fight, despite the fact that he's been ostracized, such as being forced to endure it.