|Anime Debut||Season 1: Episode 13 (cameo)|
Season 2: Episode 1
- Kotobuki Reiji (寿 嶺二) - In-charge of Ittoki Otoya and Ichinose Tokiya for the Master Course. He is also a graduate of Saotome Academy, although he is currently said to be "retired". His instrument specialty is the maracas. He is voiced by Morikubo Showtaro.
- Kurosaki Ranmaru (黒崎 蘭丸) - In-charge of Hijirikawa Masato and Jinguji Ren. The eldest son of the now-collapsed Kurosaki conglomerate. His instrument specialty is the bass guitar. He is voiced by Suzuki Tatsuhisa.
- Mikaze Ai (美風 藍) - In-charge of Shinomiya Natsuki and Kurusu Syo. His instrument specialty is the synthesizer. He is voiced by Aoi Shouta.
- Camus (カミュ) - In-charge of Aijima Cecil. From the Silk Palace. His instrument specialty is the cello. He is voiced by Maeno Tomoaki.
Artist/s are not listed as QUARTET NIGHT.
- You're my life
- The dice are cast (opening song from S3 ep1)
- Evolution Eve (Final ending song of Season 3)
- Le Royal
- They share their unit name with QUARTET★NIGHT, the first song the four of them performed together.