Now there's a mysterious Mask before James Blood, and the man behind it is one that shouldn't exist. What is the mystery surrounding this mask...? So begins an action-packed crime story set in a beautiful city!

Due to her mother's work, Chizuko Date has never remained in one place for long or grown attached to anything in particular. However, while temporarily staying with her grandfather Suikyou, she witnesses something extraordinary: a magical girl named Berry Blossom fighting against Chroma, member of the evil organization Fossa Magna. Seeing Berry Blossom save the day ignites a passion in Chizuko, and she swears to be a fan of the new magical girl in town thereafter. As time passes, Berry Blossom's popularity dwindles due to the incompetence of her opponent. When Chizuko randomly encounters Chroma himself, she does not hold back her complaints against him. For his part, Chroma does not enjoy being defeated again and again; moreover, Fossa Magna will force him to resign if he continues losing. In desperation, Chroma begs Chizuko to become his second-in-command and help him with his evildoings. For the sake of Berry Blossom regaining the spotlight, Chizuko must question whether it is right to join forces with the magical girl's sworn enemy.

In recent years, creatures known as Kaii have frequently attacked cities and wrought destruction. Exterminating these monsters quickly became a popular and well-respected profession, carried out by magical girls. More than five hundred magical girl companies, ranging from small ventures to large corporations, offer their aid to those who need it. Kana Sakuragi is a studious college graduate struggling to land a job despite attending numerous interviews. But when a Kaii attacks during her latest interview, she finds herself assisting the magical girl responding to the crisis. Although she lacks battle experience, Kana relies on her exceptional memory and knowledge to help subdue the monster. Hitomi Koshigaya, the headstrong magical girl who faced the Kaii, recognizes Kana's potential and invites her to join Magilumiere Magical Girls Inc.—the startup where Hitomi works. Wishing to make a difference, Kana accepts the offer to become a magical girl herself. While Kana may not be suited for the corporate world, it soon becomes clear that her true calling is to rise as one of the most talented magical girls in existence.

For over a century and a half, two interstellar states have wrested for control of the Milky Way. The Galactic Empire, an absolute monarchy ruled by Kaiser Friedrich IV and an entrenched nobility, seeks to suppress the rebels daring to oppose the inviolable crown. The Free Planets Alliance, a representative democracy led by a corrupt High Council, degenerates as its elected leaders⁠ use war and conflict as a way to win popular support. But this long-standing stalemate between the Empire and the Alliance ends with the rise of two opposing military geniuses. Reinhard von Lohengramm, a minor noble and High Admiral of the Empire through his strategic brilliance and his sister's position as the favored concubine of the Kaiser, dreams of conquering the galaxy and uniting mankind under his iron fist. Meanwhile, Yang Wen-li of the Alliance, an avid historian and reluctant commodore hailed as the Hero of El Facil, uses his tactical prowess to navigate around his leaders' incompetence—and to carve the path to lasting peace. As the war rages on, Reinhard and Yang each strive for their ideals and to secure their place among the stars as the leaders of a new era of galactic heroes. [Written by MAL Rewrite]