NIJIYON ANIMATION: Yu and the School Idol
NIJIYON ANIMATION: Shinsaku Animation · にじよん あにめーしょん 新作アニメーション
Synopsis
Unaired episodes 13-15, included in the NIJIYON ANIMATION Blu-ray box. Kasumi, Shizuku, Karin, Ai, Kanata, Emma, Setsuna, Rina, Shioriko, Mia, Lanzhu, and Ayumu all tell Yu how much they love her. (Source: Crunchyroll, edited)
Studios: Sunrise, Bandai Namco Filmworks, Bandai Namco Music Live, Bushiroad, KADOKAWA
Source: MANGA