Put this on when you need proof that anime can just be kind to you for a few minutes. Mirai Harmony is the entire Nijigasaki High School Idol Club singing as one unit, the second track off their first single, from back before the TV series handed everybody a solo song and a personal arc to cry about. There is no conflict here and no stakes, only the whole club stacking into a chorus while the animation exists purely to carry the track. The BD cut is the real move: it welds this to Muteki-kyuu*Believer and slips roughly two minutes of story in between, so you get eight and a half minutes of the club simply being a club. Fans who arrived through the 2020 anime come back here and realize they already knew every note. Loop it, go make tea, come back.

Mirai Harmony is a short animated music video for a song by the Nijigasaki High School Idol Club. The track is the second song on the club's first single, and every member of the club sings it. On the Blu-ray release, the video is joined with the clip for Muteki-kyuu*Believer, the single's first song, sung by Kasumi Nakasu. Close to two minutes of extra story scenes are added, and the result is one animated piece that runs about eight and a half minutes.