Mushoku Tensei: Isekai Ittara Honki Dasu - Eris no Goblin Toubatsu  Play Trailer

Mushoku Tensei: Jobless Reincarnation - Eris the Goblin Slayer, Mushoku Tensei: Jobless Reincarnation Special, Mushoku Tensei: Isekai Ittara Honki Dasu Special, 無職転生 ～異世界行ったら本気だす～ エリスのゴブリン討伐, Mushoku Tensei: Isekai Ittara Honki Dasu Part 2 - Eris no Goblin Toubatsu, Mushoku Tensei: Jobless Reincarnation Part 2 - Eris the Goblin Slayer, 無職転生 ～異世界行ったら本気だす～ 第2クール エリスのゴブリン討伐

In the fourth Blu-ray volume, there is an unaired episode that will occur simultaneously with episode 16 (episode 5 in second cours). This episode will provide additional information about Eris and Ruijerd's activities outside of the main storyline. The comment "Goblin Extermination" hinted at this content.

Mushoku Tensei: Isekai Ittara Honki Dasu - Eris no Goblin Toubatsu is an unaired episode bundled with the fourth Mushoku Tensei: Isekai Ittara Honki Dasu Blu-ray volume.