Even though the Last volume in the Series was supposed to be the end, we got volume 6. It is nice that these novels are closer to 400 pages, than the 180 pages some of the other Light novels come in as.
Meriala after a fight with Seig, decides to find her missing Master. What she finds is a Mysterious underwater Castle, with various monsters and puzzles to Solve. With help of the Black Iron Freight company and later Seig, she learns a bit about her Master and the History of the Fell forest.
The novel while not a needed part of the story was still entertaining to read.