"In For a Penny, In For a Pound " is the sixth episode of Durarara!!x2 Ketsu and the fifty-eighth episode overall of the Durarara!! anime.
Izaya Orihara, delighted by how thoroughly Mikado Ryuugamine has exceeded his expectations, makes plans to remove Ikebukuro's non-humans from his human stage – Shizuo Heiwajima included. With Chikage Rokujou's support, Masaomi Kida sets out to stop Mikado Ryuugamine once and for all, and Anri Sonohara musters newfound resolve thanks to Saki's advice. But what could Ran Izumii want with Mikado Ryuugamine...?
adapted from what manga or LN chapter?
references to previous episodes?
In order of appearance (not including OP)