Lucifer and the Biscuit Hammer

College student Amamiya Yuuhi is thoroughly unremarkable-average grades, average looks, and an indifferent attitude toward life. So when a talking lizard appears one day to tell him about a massive hammer floating in space, ready to smash Earth to pieces, and demands his help fighting evil, his first instinct is to ignore it. But fate has other plans. A superpowered princess forces him into the fray, dragging him away from his dull, ordinary life. Now, Yuuhi finds himself on the adventure of a lifetime. Teaming up with the reckless princess and a ragtag group of allies, he must confront a sinister mage and his terrifyingly strong homunculus before the so-called Biscuit Hammer obliterates the world.