Mushoku Tensei: Jobless Reincarnation, book 3
Rifujin na Magonote et Shirotaka2014

Teleported to an unfamiliar land by a mysterious magical disaster, Rudeus and Eris are going to have to rely on their own wits to survive—and on each other! Which is easier said than done, especially when they find themselves face to face with one of the Superd, the murderous demon race Roxy warned Rudy about…

Titre original : Mushoku Tensei: Isekai Ittara Honki Dasu, book 3 (2014)