Bøger i Lucifer and the Biscuit Hammer serien

Everything about college student Amamiya Yuuhi is average. So what happens when he awakens one day to a talking lizard, who informs him that there is a gigantic hammer in outer space that is poised to split the Earth into pieces. Yuuhi will join forces with the capricious princess and a motley crew to fight back against an evil mage.