Muteki-kyuu*Believer / Mirai Harmony

無敵級*ビリーバー / 未来ハーモニー

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.

(Source: Anime News Network, AniList.co)

Note: 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.