The Frontier Lord Begins with Zero Subjects (Manga): Tales of Blue Dias and the Onikin Alna: Volume 9 by Fuurou

When a trip to the forest leads to a meeting with a mysterious cavekin, Iluk Village suddenly finds itself with three new cavekin residents! The family of blacksmiths decides to join Dias to fulfill an ancient promise and immediately starts on building a furnace. But what good is a furnace without the magic stones to fuel it? To rectify this oversight, the cavekin and Dias embark on a hunting expedition into dangerous monster territory!