She transformed into a Spirit in volume 10 and learns about Phantom's existence. Realizing Phantom is the spirit that made Kotori a Spirit, she concludes that Phantom probably killed her parents on the same day and travels to the past with the help of Kurumi to save them. She attacked Phantom soon after but realizes after the battle that her own attack hit her parents. She then realized that the enemy who killed her parents was herself all along, thus causing her to experience great, negative emotions and caused her to go inverse as the time traveling ended.