Durarara!! Episode 17

Title: Uitenpen (有為転変) - Perpetual Shifts and Changes

Date Aired: 6 May 2010

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Previous Episode → 16

Next Episode → 18

Synopsis
Sonohara pokes Niekawa with Saika, and shows her a flashback of how she became its wielder. Meanwhile, Shizuo beats up Niekawa's "Saika children", flashing back to his past. Sonohara then assimilates Niekawa's Saika, and as a result, takes control of all of the Saikas in Ikebukuro. Mikado later visits Sonohara at the hospital, and after realizing she had met "unusual people", warns her to stay away from the non-normal. As a result of Niekawa's assimilation, Sonohara has gained her and all of the Saika's memories; she suspects that Izaya is up to something. Mikado is later shown contacting members of the Dollars, asking for information about the slasher.

Izaya is revealed to be behind several events in the slasher arc; he caused a split of the city's population into different "factions" – Saika and Sonohara's army, the Yellow Scarves, and the Dollars – and knows that they will fight amongst each other. Kida, not knowing Anri Sonohara's true nature, regains his position as the leader of the Yellow Scarves. He suspects the Dollars to be responsible for Sonohara's injuries, and vows revenge.

Adapted From
Adapted from? which chapter of manga and/or novel

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