Serial Number (Specimen Number)
Laura is confronted with a confidential memo during her bath time, Toma buys Mikasa 10032 a piece of jewelry, and many old enemies come together in the search for Last Order.
Aired 11/02/2011EP 18 - Serial Number (Specimen Number)

2010
A Certain Magical Index II
Index is still a fugitive, and many powerful magical organizations and individuals want to take her to use the books in her memory, eliminating her in the process. War between those organizations is also starting to emerge. Index can only rely on her friend Touma, who has always protected her, along with Misaka and other friends from the Academy.
(Source: Anime News Network)