Iroha Tamaki, a Student in Takarazaki City, has been battling Witches as a Magical Girl. However, Iroha can't seem to remember the wish she made when she became a Magical Girl. One day, she hears a rumor from another Magical Girl, Kuroe, that Magical Girls can be saved if they go to Kamihama City. During a battle with a Witch, Iroha unexpectedly finds herself in Kamihama but…

Iroha remembers that her wish was to cure her younger sister, Ui’s, illness; however, there is no sign of Ui’s existence in her life. She goes to Kamihama City to find clues about her, but is attacked by a Witch and subsequently saved by a trio of Magical Girls, Momoko, Rena, and Kaede. There is a rumor going around about the Friendship Ending Staircase at Rena and Kaede’s school. Momoko and the others believe that a Witch is involved in the rumor, so they’ve been investigating it, but…

Rena wrote Kaede's name on the Friendship Ending Staircase. Kaede apologizes to Rena, but she is kidnapped by the Chain Monsters, confirming that the rumor about the staircase was true. In order to find Kaede and bring her back, Momoko and her companions come up with a strategy to lure out the Chain Monsters. Yachiyo has joined the group after being asked by Momoko to help them. Yachiyo claims that Iroha will hinder the operation and refuses to let her participate in the battle with the Chain Monsters.

To fulfill their promise to Ui, Touka and Nemu set their plan in motion with Embryo Eve. Yachiyo desperately tries to stop them. As Alina watches events unfold, Kuroe is isolated and alone. And Kyubey is not far behind… Meanwhile, Iroha wakes up in her room at home. Everything looks the same as when Ui was still around. Finally, Iroha is reunited with Ui.