As a Dragon Slayer, I Was Bound by a Contract to a Paranoid Evil Dragon

By chance, he encounters a paranoid evil dragon. He gives it everything he's got, but still can't beat her. Then he provokes her with a few words, bringing down her furious revenge. And the evil dragon's chosen form of revenge is...

"Here, put on this ring. We're bound together until death!"

Looking at the contract ring on his finger, then at the snarling female dragon in front of him, the dragon slayer Reno thinks:

Are you crazy, evil dragon? This is a once-in-a-lifetime dragon soul contract!

Could she be trying to trample on my dignity as a dragon slayer?