Mushoku Tensei: Eris wa Honki de Kiba wo Togu

Eris Boreas Greyrat was once a sheltered noble girl until a sudden catastrophe transported her and her cousin, Rudeus, to the far side of the world. Stranded in an unfamiliar and dangerous land, she dedicated herself to mastering the blade, evolving into a formidable swordswoman determined to survive. Yet despite her relentless training and newfound strength, she faced a devastating reality when she proved powerless to protect Rudeus as he stood on the brink of death. Haunted by her inability to shield the person she cared for most, Eris is forced to confront her own limitations. Rather than continuing to rely on his protection, she resolves to forge a new path, choosing to leave Rudeus behind so she can embark on a solitary journey of growth. Her ultimate goal is to transform herself into a warrior capable of standing firmly by his side as an equal source of support. This manga serves as a compelling spinoff of the Mushoku Tensei series, diverging from the main storyline around the events depicted in chapter fifty-one of the original light novel and the conclusion of the anime's first season.