Side story of Kyoukaisenjou no Horizon bundled with the first press release of the 1st, 3rd, 5th and 7th Blu-ray volume of both seasons of anime.

This side story follows Asama, Kimi and Mitotsudaira aboard Musashi one year before the beginning of the main story, as Asama is considering to create a music band together with her two friends for the next festival in Aki, a territory under the governance of K.P.A. Italia.