The Invincible Shovel Novel Volume 4 features story by Yasohachi Tsuchise and art by Hagure Yuuki.

Alan has literally gone to Hell and back to reclaim the final orb. Soon, with Princess Lithisia’s wish, the Kingdom of Rostir will, at last, be free of its demonic usurper. So it seems, at least, until the princess is faced with her dark mirror, the great demon queen Sho Ve Lithisia. If Alan wants to defeat this evil queen, he’ll have to do the unthinkable–turn his shovel on his own princess.