The special is directed by Masaki Nishiura (Densha Otoko) with scripts by Yoshihiro Izumi (Ranma 1/2). The special is planned by Yuta Kano (One Piece) and is produced by Sumi Asano (Sazae-san live-action special). The special will feature the theme songs from the anime series, namely "Aoi Shiori" by Galileo Galilei and Silent Siren's cover of "secret base ~Kimi ga Kuretamono~" as opening and ending themes, respectively.
The special, which will premiere on September 21st will air from 9pm-11:18pm.
[Source: Anime News Network]