Arai, Midori

He serves as the Sacrifice Unit for Breathless. Being the stronger of the pair, he acts as Ai's sacrifice, bolstering her strength through encouraging words and strategic advice on how to best defeat Soubi.
When ordered to cease their attempts to retrieve Ritsuka, they speak with him to warn against trusting Soubi, but are subsequently sent home to complete their schooling. They share a close bond and dislike being separated. Their names are inscribed on the palms of one of their hands.