Yuuki Yuuna wa Yuusha de Aru

Synopsis

Mimori recalls the events following the loss of her memories, including her first meeting with Yūna. After becoming friends and entering middle school, the pair were recruited by Fū to join the Hero Club, later joined by Itsuki, where they performed a lot of volunteer work. After learning the truth from Sonoko, Mimori attempted suicide many times in order to prove the fairies were there to bind her to her duties. Back in the present, while the others are consoling Fū, Mimori, having discovered her legs and memory were lost because of the Mankai form and that everything from her standard of living to moving near Yūna was arranged by Taisha, once again approaches Sonoko, who tells her the true nature of the world. Investigating the Shinju, Mimori sees the true nature inside it; a hell filled with smaller Vertexes that are rebuilding the Vertex that were already defeated, dooming the heroes to continue battling until they become disabled. Not wanting the others to suffer like Sonoko did, Mimori believes the only solution is to destroy Shinju, blasting a hole which unleashes several smaller Vertexes into the forest.

(Source: Wikipedia)