Tennin Karakusa

Okamura Kyoko is drowning in complete psychosis, but how has she ended up like this? Her childhood wasn't hard, she swam in complete happiness... What has caused her illness?
(Source: Bunshun Bunko, translated)
Note: also includes the one shots Circe (Majo) (キルケー(魔女), Natsu no Guuwa (夏の寓話), Akumu (悪夢)