Mushoku Tensei: Jobless Reincarnation S00 E01 Eris the Goblin Slayer

Unaired episode included in the fourth Blu-ray volume. The episode will take place during the same time in episode 16 (episode 5 in second cour) and depict what Eris and Ruijerd were up to outside the main story, as teased by the comment "Goblin Extermination."