The mysterious sender, an Uwasa named Ai, asks Iroha to enter the Endless Solitude and delete her in order to free Sana, who is trapped in there. A flashback shows how Ai was befriended by Sana, who came to the Endless Solitude as she felt she didn't belong in the outside world after wishing to become invisible. As Iroha arrives in Endless Solitude to rescue Sana as per Ai's wishes, another magical girl from the Wings of the Magius, Alina Gray, appears and attacks with her Doppel. Ai manages to teleport Alina away but is hit by her Doppel's attack, asking Sana to destroy her before it takes her over.