Shoujo Negau ni, Kono Sekai wa Kowasu beki: Tougenkyou Houraku

I will destroy this world―― After getting her village destroyed and persecuted by demons and cruel humans, Shitenji Kagari, a fox spirit, got to hate the entire world. In response to her wish, Kamitsu Saki,who sealed himself away many years ago, appeared before her. Despite being the strongest saint and having been known as the champion of five colors, he chose to show himself..... naked. "That was pretty close," said Ayaki who annihilated the enemies while wielding a divine blade. "It seems like, one way or another, I became your Shikigami - or to put it plain and simple - your slave. What do you wish for?」 (Source: Dengeki Bunko, translated)