Upon awakening, Tsukishima Minori found herself in an unfamiliar, diminutive, white-walled space. Lying beside her was Ichi, a young man with enchanting, floppy rabbit ears who proclaimed himself as her guardian spirit. He explained to her that the room they were in was known as "Kuranoa", which had the power to mirror a person's innermost being. Additionally, he informed her that she had lost her memory during an accident she had on her way to school, and her twin, Shiori, had suffered the same fate. Astonishingly, they now shared a physical vessel.