Durarara!! SH, Vol. 4 (light novel)

IN A CITY FULL OF PEOPLE, YET FEELING COMPLETELY ALONE... Tucked away in Ikebukuro is a little shop of curios called Sonohara-dou. While there are many intriguing items to be had at this store, one person in particular visits for Saika, the cursed sword in Anri's possession. Although the visitor leaves empty-handed, Sonohara-dou is broken into in the middle of the night. Was anything stolen? Anri isn't sure, but Yahiro, Kuon, and Himeka swear to help her out. Meanwhile, busy again as a courier with a mysterious new job, Celty hears about Anri's problem. She visits the shop out of concern, only to see Akabayashi and a host of other Saika-related people... What is the mystery that lurks behind this sudden rush for control of Saika?!