Bon is a female character depicted as a child, possessing purple hair and purple eyes. She belongs to a family of shrine guardians tasked with sealing supernatural creatures across generations, establishing a heritage of spiritual guardianship against otherworldly entities. Her experiences involve confronting eerie phenomena tied to children's perceptions of unseen presences within everyday settings.

Bon interacts closely with Koko, a quiet boy isolated from others who communicates openly only with her, positioning her as his trusted confidant. Stories featuring Bon explore themes of unease and the ambiguous boundary between the ordinary world and supernatural forces sensed by children. Her role is integral to the anthology's focus on childhood intuitions of hidden horrors.