The Eris side story Chapter 1 is out now on Gangan Online : r/mushokutensei

DISC] Mushoku Tensei Eris Gaiden - Ch1.1 : r/manga

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Read Manga Mushoku no Tensei – Eris Gaiden - Chapter 1

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Mushoku Tensei: Roxy Gets Serious Spinoff Manga Ends With 12th Volume (Updated) - News - Anime News Network

A new Mushoku Tensei spin-off manga series titled Mushoku no Tensei - Eris Gaiden by Okano Yuu & Higake Take based on Eris when she separated from Rudeus Start on Gangan Online

SF & Fantasy Manga – 2 Label_Gangan Comics UP! – Japanese Book Store

A new Mushoku Tensei spin-off manga series titled Mushoku no Tensei - Eris Gaiden by Okano Yuu & Higake Take based on Eris when she separated from Rudeus Start on Gangan Online

New cute comic strip art from Honkai: Star Rail official pages ! : r /HonkaiStarRail

Read Manga Mushoku no Tensei – Eris Gaiden - Chapter 1