Muteki-kyuu*Believer / Mirai Harmony
Japanese title: 無敵級*ビリーバー / 未来ハーモニー
Type: Music
Source: Original
Episodes: 1
Status: Finished Airing
Aired: Jul 29, 2020
Duration: 8 min
Rating: PG-13 - Teens 13 or older
Studios: Sunrise
Producers: Magic Capsule, Kadokawa, Bandai Namco Arts
Themes: Idols (Female), Music

Animated music video for Nijigasaki High School Idol Club's first song of their first single titled Muteki-kyuu*Believer sung by Kasumi Nakasu and Nijigasaki High School Idol Club's second song of their first single titled Mirai Harmony sung by the entire Nijigasaki High School Idol Club. 

The BD release combines both with additional story bits that cover roughly 1 minute and 58 seconds into a single 8 minute and 30 seconds long animated video.

(Source: ANN, Anilist)