He is the Sacrifice Unit of Breathless, known to be the stronger of the two. As Ai's sacrifice, he empowers her with his encouraging words and strategic advice on how to best defeat Soubi.
After they are instructed to cease their efforts in retrieving Ritsuka, they speak to him, warning him not to trust Soubi. However, they are then sent back home to complete their own education. They share a close bond and dislike being apart. Their names are inscribed on the palms of one of their hands.
(Source: Novellalive and Angel Fire)









