While playing a smartphone game known as Magical Girl Raising Project, Koyuki Himekawa, a middle school girl who loves magical girls, is chosen by the mascot character, Fav, to become a real magical girl known as Snow White. As Koyuki uses her ability to hear people in danger to help them out, she uses her Magical Phone to talk to the other magical girls residing in the city. The next night, Koyuki is called out by one of the other magical girls, La Pucelle, who reveals herself to be her male childhood friend, Souta Kishibe, and asks her to partner up with him. The next day, Fav informs everyone that he plans to cut the number of magical girls in the region down to eight.

The Magical Girls are shocked to learn, from Fab’s sudden announcement, that, each week, a Magical Girl is chosen to drop out when she doesn’t collect enough Magical Candies. Hosonami Hanano, also known as Ripple, is desperate to find ways to serve people along with her companion, Top Speed. Nemurin, who can only accomplish anything in her dreams, meanwhile, worked at a more leisurely pace. And the first dropout was announced.

The Magical Girls are frantic, trying to avoid being dropped out. Sister Nana stumbles upon a conversation log between Fab and Cranberry, and she discovers that dropouts lose not only their magic but also their lives. Amidst anxiety and panic among the Magical Girls, Fab announces a game system update.

Ruler and her minions storm Snow White and La Pucelle in an attempt to steal their Magical Candies. La Pucelle responds with everything she has, but Ruler and her people make off with her candies, devastating Snow White. Just as the second dropout is announced, a sixteenth Magical Girl arrives.

Sister Nana appeals to the Magical Girls to devise a peaceful resolution to the situation. Ripple finds this annoying, and points out her hypocrisy. Cranberry contacts Sister Nana during her work. Relieved to find someone who understand her, Sister Nana and Winter Prison head off to their rendezvous point.

Out of the blue, Cranberry challenges La Pucelle to a duel. Confused, she takes the challenge. Three days later, Fav announces the third dropout, as well as the addition of new items. Magicaloid 44 asks Calamity Mary to join forces with her. She agrees, but on a condition: “Kill someone.”

Snow White grieves the loss of her only supporter, even as she treads in fear of Hardgore Alice, who had been pursuing her relentlessly. Calamity Mary, in an attempt to negotiate one-on-one with Fab, learns of who killed Magicaloid 44.

In an effort to instigate a fight with Ripple, Calamity Mary indiscriminately sets cars on fire along a highway. Ripple is enraged at this act. Snow White and Hardgore Alice arrive at the scene to rescue the innocent bystanders. Someone else lied in wait for their prey, amidst the flames and gunshots and screaming.

A few days after the massive tragedy on the highway, Snow White and Hardgore Alice can be seen tending to each other’s emotional wounds. Along with the announcement of the new dropout, a new rule is announced: that the standing Magical Girls would be reduced to four. The Magical Girls scramble, having realized that the game wasn’t over.

Swim Swim, having set her sights on Cranberry, executes her plan of luring her out for an ambush. But Cranberry was the most powerful, most wicked Magical Girl. Meanwhile, Ripple, having decided to avenge Top Speed, calls on Snow White to give her information regarding Swim Swim.

Snow White’s explanation falls on deaf ears, and Ripple engages Swim Swim in a fight to the death. Koyuki laments the powerlessness of the Magical Girls, doomed to fight and kill each other until their own deaths. Just when Koyuki gives up being a Magical Girl, Fav divulges the true purpose of the Magical Girl Raising Project.