Durarara!!x2 Ketsu Episode 12

"Those Who Meet Must Part" is the twelfth episode of Durarara!!x2 Ketsu and the sixty-fifth and final episode of the Durarara!! anime.

Synopsis
"I'm going to bring an end to the Dollars along with myself."

As Mikado makes up his mind, a shot rings out across the night sky in Ikebukuro. For Izaya and Shizuo, wounded and vicious, the time has come for their final showdown. Now that Celty has lost all of her memories of her life in Ikebukuro, what course of action will Shinra take? This story of a boy who yearned to lead an extraordinary life - a twisted love story - is about to reach its final act!

Adapted From
adapted from what manga or LN chapter?

Referbacks
references to previous episodes?

New Characters
In order of appearance (not including OP)

Unanswered Questions

 * Where did Haruna take Takashi?
 * What happened to Hiroto?