According to an announcement on the official site for "Kyoukai no Kanata
," three anime shorts for the series will be posted beginning on November 18, 2013. The shorts are titled "Kyoukai no Kanata: Idol Saiban! - Mayoi Nagara mo Kimi wo Sabaku Tami."
Each of the episodes will have the female main characters cast as Chibi Angels who hold a trial for a different character of the series. Akito Kanbara
will be the "defendant" for the first episode.
Source: Official site
Kyoukai no Kanata: Idol Saiban! Mayoi Nagara mo Kimi wo Sabaku Tami