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.
Recommendations
KanColle Movie
MOVIE
72%
K-ON!: Live House!
OVA
77%
Tamako Market Specials
SPECIAL
62%
Azur Lane Anime PVs
SPECIAL
69%
High School Fleet OVA
OVA
70%
Sabagebu! OVA SPECIAL MISSION
SPECIAL
70%
Shoujo Shuumatsu Ryokou
TV
81%
Shuumatsu no Izetta
TV
64%
Shuumatsu Train Doko e Iku?
TV
73%
Na-Nare Hana-Nare
TV
62%