"Magia Record: Puella Magi Madoka Magica Side Story" is a spin-off of the original "Puella Magi Madoka Magica" series, set in an alternate timeline. The story centers on Iroha Tamaki, a magical girl who travels to Kamihama City in search of her missing younger sister, Ui. Kamihama is a city where magical girls are drawn by rumors of a solution to their inevitable fate of becoming witches. Iroha’s journey intertwines with other magical girls, each grappling with their own struggles and desires.

The narrative explores the dynamics of magical girls in Kamihama, where the presence of "Rumors"—supernatural entities born from collective belief—adds complexity to their battles. Iroha forms alliances with characters like Yachiyo Nanami, a veteran magical girl, and her team, which includes Tsuruno Yui, Felicia Mitsuki, and Sana Futaba. Together, they investigate the mysteries of Kamihama, including the enigmatic "Wings of the Magius," an organization claiming to offer salvation to magical girls.

As Iroha delves deeper, she uncovers connections between her past, her sister’s disappearance, and the city’s secrets. The story examines themes of hope, despair, and the cyclical nature of suffering inherent in the magical girl system. The plot builds on the original series’ lore, introducing new elements like the Doppel system, which allows magical girls to temporarily release their inner darkness without transforming into witches.

The series maintains a balance between character-driven drama and action, with Iroha’s determination to save Ui serving as the emotional core. The narrative also highlights the moral ambiguities of the magical girl system, as characters confront difficult choices and the consequences of their wishes. The interplay between personal struggles and the larger mysteries of Kamihama drives the story forward, culminating in revelations that challenge the characters’ understanding of their world.