Rudeus Greyrat, the reincarnated mage, drifts through depression after parting ways with Eris, still searching for his missing mother, Zenith, in the frontier town of Rozenberg, in an arc from the light novel the main manga left out. Taking work with the B-rank adventuring party Counter Arrow, he meets the sharp-tongued Sara, whose resemblance to the person he lost keeps catching him off guard as they work jobs together.