These are the four characters from the Nightcord group in Colorful Stage.

Yoisaki Kanade | 宵崎 奏

Yoisaki Kanade,

Shinonome Ena | 東雲 絵名

Shinonome Ena, braid,

Akiyama Mizuki | 暁山 瑞希
Use one or the other group in this set.
Note: Mizuki is tagged as unknown gender. Use 1other for them specifically as such.

1other, Akiyama Mizuki, sidelocks, bow,

1other, Akiyama Mizuki, side ponytail,

Asahina Mafuyu | 朝比奈 まふゆ

Asahina Mafuyu, high ponytail,

Ena and Mizuki's school outfit

kamiyama high school uniform (project sekai), bowtie, bow, collared shirt, long sleeves, black pantyhose, plaid pleated skirt,

Mafuyu's school outfit

miyamasuzaka girls' academy school uniform, scrunchie, pleated grey skirt, sailor white collar, black pantyhose, black cardigan, grey serafuku, red neckerchief, long sleeves, grey shirt,