Aya #1 is a young woman inhabiting a village of travelers who abandoned their past lives. Her left cheek bears a large, distinctive scar, a permanent reminder of profound despair that drove her to attempt suicide by drowning in a river near a waterfall—the event that caused the scar.

Following this attempt, she was drawn to a village established by a spider yōma disguised as an old priest, a refuge for those who lost the will to live. The yōma priest offered an illusion of peace by erasing traumatic memories, including Aya's recollection of her suicide attempt and the scar's origin. This enforced amnesia allowed villagers to live in ignorant contentment, marked by frequent drinking and parties, while suppressing their despair and the village's sinister nature.

Aya exhibits a gentle, somewhat naive demeanor, welcoming travelers like the ninja Hikage and introducing him to villagers. She forms a tentative connection with Hikage during his investigation. Her psychological fragility surfaces through moments of distress, such as nightmares. A haunting element is the "Ghost Counting Song" ("Yōma Kazoe Uta") she sings, with lyrics like "Two, the two of us go to hell; Three, even though we kill everybody; Four, signpost for the land of the dead," reflecting the village's underlying darkness and foreshadowing its fate.

Her story culminates when Hikage kills the spider yōma priest, breaking the amnesia spell. Aya regains her suppressed memories, including the trauma behind her scar. Overwhelmed by despair, she returns to the river and drowns herself, replicating her initial suicide attempt. Hikage discovers her body the next morning. Concurrently, the entire village perishes, unable to endure their restored memories.