Ideal Sponger Life Vol. 18 (manga)

The royal family of Capua has at long last perfected their secret method for producing crystal marbles - objects which can be used to help create enchanted items more quickly and more powerful than ever before. Even if trading them away is bound to make Capua rich, Zenjiro can’t help but feel a sense of dread, since it brings the world one step closer to an age of large-scale magical manufacturing and the end of the current world order. Perhaps the answer to this dilemma lies with taking on a second concubine… even as his first concubine, princess Freya, prepares to take a journey with Zenjiro across the wide expanse of the northern sea.