Arifureta Shokugyou de Sekai Saikyou Shouhenshuu

A compilation of all the extra short stories written for the early volumes of Arifureta, along with one brand new short story written specifically for this volume! After clearing the Sunken Ruins of Melusine, Hajime and the others encounter a massive creature, and are transported to a strange new world. Separated in transit, our heroes start searching for each other, and a way out. But though they don’t know it, a miraculous encounter is waiting for them at the end of this journey!

(Source: J-Novel Club)