Durarara!! Re;dollars Arc, Vol. 5 - Narita, Ryohgo creator

Megahit idol Ruri Hijiribe is suffering at the hands of a stalker, and his obsession with her is growing by the day. In order to see how she reacts, he becomes more strident in attacking and hurting those around her. One of the innocent (?) victims is the doctor and love of Celty the Headless Rider, Shinra Kishitani. As she clutches his wounded body, Celty loses her head with rage! (Literally.) And you just know who else is gonna show up behind the scenes...It's Ikebukuro, after all!