Who narrated episode 1 of Durarara!!×2 Ten? A good bit of episode 1 of Durarara!!×2 Ten (i.e. episode 13 of the broader "second season") was narrated by one of the female characters. But this show has a gorillion characters, and I can't place which one of them it was. 

The end credits list the following female characters for this episode:


Sonohara Anri (Hanazawa Kana)
Celty (Sawashiro Miyuki)
Karisawa Erika (Takagaki Ayahi)
Yagiri Namie (Kobayashi Sanae)
Awakusu Akane (Kuno Misaki)
Mamiya Manami (Tanoue Marina)
Kamichika Rio (Tomatsu Haruka)
"Nurse" (Yamamura Hibiku)
"Woman" (Satou Kanami)


I've struck through the ones where I'm familiar enough with the voice actor to know it can't be them.
http://durarara.wikia.com/wiki/Durarara!!_x2_Ten_Episode_01

the above wiki link states that it was "Rio Kamichika". The link below is her page. enjoy.

http://durarara.wikia.com/wiki/Rio_Kamichika