Iori Aiba is the younger sister of Takashi Aiba. She suffered a minor case of Luna Sedata Syndrome and visited Rougetsu Island with her brother while he was researching there. Iori was hospitalized in 1970, after witnessing the failed Rougetsu Kagura, causing her to contract the disease. The door to Iori's room cannot be opened, due to the doorknob being broken by her so she wouldn't have to go outside.