So Ra No Wo To Specials

ソ・ラ・ノ・ヲ・ト

According to the official website, two extra episodes will be included in the Blu-ray and DVD volumes 4 and 7 of "Sora no Woto". The volumes 4 and 7 will be released on June 23rd (episode 7.5) and September 22nd (episode 13), respectively.

(Source: AniList.co)