. Shadows are the manifestations of people’s hearts(zingai) that become dark and violent as they consume other people’s hearts, leaving the victims in comas. Tobis works for an organization that hunts shadows, he uses his Zingai, Baku a duffle bag with a mouth, to fight and destroy shadows. Is currently mentoring a boy named Rei who has recently begun to be able to see Zingai(only people who have gone through something traumatic can see Zingai, most people don’t know about zingai). 