Bái and Qīng

Bái and Qīng (白と青, Shiro to Ao; Literally: White and Green) are a pair of given to Hitori Koyama while she was undercover in the. Other than the fact they are surprisingly durable, they do not appear to possess any unique properties. Hitori is particularly attached to the pair of blades, and has always ensured that they are retrieved after being used.