Lucifer and Biscuit Hammer

One day, college student Yuuhi meets a talking lizard who turns him into a member of the Beast Knights with a superpowered ring! Suddenly, he's saved from an attack by the girl next door, Samidare, who just so happens to be a demon lord and Earth's would-be conqueror! Drawn to Samidare's absurd strength and evil charms, Yuuhi becomes her devoted servant and works to support her wicked schemes.