Learning Mimori is at the center of the Vertex outbreak, Yuna and Karin chase after her into the barrier, learning what Mimori herself had learned. Before they can try to reason with Mimori, who believes destroying the Shinju is the only way to spare her friends from suffering, Yuna and Karin are forced to retreat from the Vertex. Yuna’s confusion over the matter leaves her unable to transform into a hero, believing herself to be a failure as a friend. Wanting to fulfil Yuna’s desire to stop Mimori and be together again, Karin goes off on her own to fight through the Vertex standing between her and Mimori, undergoing Mankai multiple times in the process. As a result of the battle, Karin ends up losing her sight and hearing, as well as the use of most of her limbs, by the time Yuna finds her. Meanwhile, after Fu and Itsuki fail to stop her, Mimori attempts to destroy Shinju by luring the Vertex’s attack towards it, but the attack is stopped in its tracks by Yuna, who is determined to protect Mimori.