Background source?
have no idea, i tried to find it but i cant. maybe i'll try look more deeper
i just only took this background from someone's map
sorry i still cant find it, probably they just took it from "image" google and search with word that related to "amatsuka uto goodbye sengen"
@[-Yukari-] its from official mv
yeah i know, but he need the original link i only know the artist but not the source link