a Thing Hiding in a Erotic CultMidarana Kakyou ni su kuu Mono, 淫らな邪教に巣喰うモノ

Tooru and his sister Yume end up in hospital after a traffic accident leaving their father brain-dead when suddenly Itou Yuuzen appears out of nowhere and takes them under his “religious cult's” protection. Is this the beginning of a new life for the brother and sister or something is hidden behind the facade of this religious cult?