Saya returns to the shrine to find her father unconscious on the floor, leading her to wonder if he might be keeping something from her. When an Elder Bairn attacks the school, she must choose between keeping her secret and saving her classmates.

Saya begins to question her past, her memories--even her identity--but is interrupted by an Elder Bairn before she can get any answers from her father. Later, in the shrine's archives, Saya and her teacher make a shocking discovery.