Talk:Countermeasures/@comment-25874225-20141226231053/@comment-397235-20141227071712

Aya and Yumi were never part of Countermeasures, any more than Kouichi and his group. Aya's just one of Izumi's lackeys; she fills Takako's role from the manga, except she dies much earlier on.

So far as I know, the only people canonically in Countermeasures are Izumi in all versions (except the movie, where she's not really ever explained) and Tomohiko in the manga. It's heavily implied Takako and Junta were both working for her in the anime but never directly stated; in the novel, I think she's a lone wolf.