It was serialized in Shōnen Gahōsha's seinen manga magazine Young King OURs from April 2005 to August 2010, with its chapters collected in ten tankōbon volumes.

The lizard explains that Yuuhi has been chosen as a Beast Knight, a magical warrior destined to help a princess defeat a mage seeking to destroy the world with a giant mallet floating in space called the Biscuit Hammer.

While Yuuhi initially is not interested in getting involved, he changes his mind when he meets the princess, Samidare Asahina, who tells him her intent to defeat the mage and save the world so she can destroy it herself.

Written and illustrated by Satoshi Mizukami, Lucifer and the Biscuit Hammer was serialized in Shōnen Gahōsha's seinen magazine Young King OURs from 28 April 2005[25][26] to 30 August 2010.

The series was produced by NAZ and directed by Nobuaki Nakanishi, with Satoshi Mizukami, the original author, and Yūichirō Momose writing the scripts, Hajime Hatakeyama designing the characters, and Takatsugu Wakabayashi composing the music.

[60] Reviewing the first omnibus volume for Anime News Network, Rebecca Silverman commented that the story "takes a while to hit its stride, but when it does, putting it down becomes difficult", writing that "underneath the goofy start and typically comedic devices of absurdly powerful girls and talking animals, Lucifer and the Biscuit Hammer is hiding a very dark story" which makes it "feel very different from most of the other series currently available in English."