Yen Press has a lot of spinoff material for this property and one more is on the way with the 2018 series Magia Record: Puella Magi Madoka Side Story. The book comes from Fujino Fuji as serialized in Manga Time Kirara Forward and has one volume out so far. Yen Press is looking to bring it out beginning in December 2019 with more formal details to come regarding the project.
Plot Concept: After seeing an unfamiliar girl in her dreams, Iroha Tamaki finds herself chasing a tiny Kyubey into Kamihama, a city where magical girls gather. What secrets does this city hold, and how will Iroha cope with life as a magical girl herself? A new story unfolds in this manga adaptation of the upcoming mobile game!