Durarara!!

"Mysterious chat room messages, all posted under the name "Saika," profess love for all humanity--and for one man in particular. Saika's target: Shizuo Heiwajima!! Over fifty people have been struck in the worst case of serial slashings in the history of Ikebukuro. But the slasher's victims have tasted not only the blade, but also the vision of their attacker. A vision of love, love, love that can only be realized when their own blades have pierced the bodies of their beloveds"--Back cover.