The Saintess Luna used her immense power to save the people, only to be executed for a crime she didn't commit. Now, she's been reincarnated 300 years in the future, with all of her incredible powers intact.

"I don't care if someone's in trouble anymore. I'll never save anyone again. I'm going to become a villainess!"

With this new vow, she enrolls in the Saintess Academy, aiming to secure the role of the story's villainess. She even starts a side career as an adventurer, hiding her true identity beneath an armor. But her overwhelming holy power ends up causing massive trouble wherever she goes?!