魔王ムマ

The Demon Queen, a ruler with absolute authority and destructive power.
She defeated the heroes in her way and the conquered the world in practically no time.

She’s nearly all-powerful, but she has one weak spot: Her chest is as flat as the day she was born.

In terms of power, she stands at the top of her fellow succubi and other lust demons, but lacks any kind of sex appeal. Even when she tries to be sexy, it just ends up looking ridiculous. This lack of breasts left her without any dignity before her peers.

MangaGamer