The Dragon Slayer Becomes a Demon Dragon Princess

The strongest hero becomes a dragon princess after defeating the Dragon Empress?

He was the strongest hero, but under the threat of the Goddess of Light, he set out to slay the dragon, or else be turned into a girl.

But then...

The awakened hero stared at his own body: slender, fair limbs and long black-to-purple ombre hair reaching his waist. He could hardly believe it.

“No way!”