Lucifer and the Biscuit Hammer

Lucifer and the Biscuit Hammer, known in Japan as Samidare of the Stars (惑星のさみだれ, Hoshi no Samidare), is a manga series written and illustrated by Satoshi Mizukami. The series is published in North America by Seven Seas Entertainment.

Plot
The world is in mortal peril. Sir Noi Crezant, the Lizard Knight, has been sent to gain the aid of the great warrior Amamiya Yuuhi in hopes of finding the Princess Samidare and protecting the planet from the incredible "Biscuit Hammer" poised to crack the Earth in two. Unfortunately Yuuhi wants no part of it, and the Princess doesn't prove to be the shining "hero of justice" role model that Noi had hoped for.