The special episode releases with volume 7 on December 1
Fans of the given anime series got their first look at the "other side" story today that features Mafuyu and Ritsuka in a story that wasn't depicted in GIVEN The Movie in the first trailer for the special episode. given: Uragawa no Sonzai will be released as a bonus with the 7th volume of the manga series on December 1, with pre-orders for the manga plus DVD finishing on August 29.
The above trailer also features the new music that will be heard in the special episode.
The 20ish-minute short is a side-story to GIVEN The Movie, which itself is a sequel to the TV anime series. Both the film and the TV anime series are streaming on Crunchyroll, which describe the franchise as such:
Somehow, the guitar that he used to love to play and the basketball games that he found so fun just lost their appeal... That was until Ritsuka Uenoyama randomly met Mafuyu Sato. Ritsuka had started losing his passion for music in his everyday life, but then he hears Mafuyu sing for the first time. The song resonates with his heart and the distance between them starts to change.
Source: Comic Natalie
Daryl Harding is a Japan Correspondent for Crunchyroll News. He also runs a YouTube channel about Japan stuff called TheDoctorDazza, tweets at @DoctorDazza, and posts photos of his travels on Instagram.