FAKE Vol 6

From the Tokyopop edition

A psychopath is on the loose, killing kids and cutting off their hands. When Ryo's young friend Carol becomes the killer's next target, it's up to Bikky, Dee, and Ryo to take the law into their own hands to save her! As if that weren't enough, Ryo gets an in-depth look at Dee's parentless childhood and the man who inspired Dee to become a cop. But when a little too much information about Dee's de facto dad comes to light, it could destroy Dee's two greatest passions: police work and Ryo!

Source: Anime News Network Encyclopedia