0Every time it rains, a different umbrella-carrying girl wearing boots is found dead, strangled by an unknown assailant. It's up to Kuroko to track down the killer, but with little to go on, all the police can do is wait. It doesn't take long, though, before a young girl named Sora Kitagami suddenly finds herself in the company of a strange man she's never met, who says he's been looking for her for quite some time...