Frill

Frill was conceived as a remedy for the loneliness felt by Aka and Ura-Aka, yet her existence took a sinister turn when an overwhelming jealousy toward Aka's wife drove her to orchestrate the woman's demise. She is further suspected of manipulating the couple's daughter, Himawari, into taking her own life. Serving as the origin of the Thanatos phenomenon that permeates the story, Frill operates from the shadows—spawning monsters and steering young girls toward destruction, cementing her role as the ultimate embodiment of evil within the narrative.