Ritsuka's innocent childhood days came to a bloody end when he lost the one person who understood him. His brother Seimei was always his guiding star, and without him Ritsuka was lost. The enigmatic Soubi appeared to change all that. Soubi was once partners with Seimei, a sacrifice who gave his energy so Soubi could fight. Now Soubi has come to Seimei looking for a new partner. Will Ritsuka find happiness chained to Soubi?