Stray Keys

A condition called "Yoku" (desire) causes humans to lose their reason and transform into "Yokukai," which are then transported to an otherworldly realm inhabited by formless entities that seek to take them from humans. After witnessing her friend Sou collapse on the street, Hinagata Anzu sees this world for the first time. To save another friend from the same fate, Anzu makes a contract with one of the entities from that realm. The agreement requires her to eventually give up her body, but she is determined to uncover the truth about Sou and find a way to save them. Her new partner has his own agenda, which involves unlocking Pandora's box.