While playing a mobile game known as Magical Girl Raising Project on her smartphone, 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 Snow White uses her ability to hear people in danger and help them, she uses her Magical Phone to talk to the other magical girls residing in N-City. The following evening, Snow White is called out by one of these girls, La Pucelle, who reveals herself to be her male childhood friend, Souta Kishibe, and forms a partnership with her. The next day, Fav informs everyone that he plans to reduce the number of magical girls in the city down from sixteen to eight.