Mushoku Tensei: Roxy Datte Honki desu—AKA Mushoku Tensei: Roxy Gets Serious—is a manga spinoff of Rifujin na Magonote’s Mushoku Tensei: Jobless Reincarnation light novel series, and it has its ending all planned out. According to the 11th volume of Shoko Iwami’s series, the series will come to an end with its 12th and final volume when it launches this summer in Japan.
The spinoff first launched via Kadokawa’s Comic Walker website in December 2017. Seven Seas publishes the series in English and sums up the story like so:
Mushoku Tensei: Jobless Reincarnation, the sprawling isekai hit about a 34-year-old otaku reborn into a fantasy world, primarily follows the hero Rudeus Grayrat from infancy to adulthood. But this new world is filled with people who share his new life, including Roxy, the woman who trains him in the magical arts. How did Roxy become such a powerful magician on her own? Delve into Roxy’s early adventures in this backstory manga, a hot new series still ongoing in Japan!
The Mushoku Tensei: Jobless Reincarnation anime currently has a second season on the way.