Jenn -ジェン-さんのイラストまとめ

Sugawara Chie. CV: Nemoto Miyari (@/miyari_nemoto)

She's a shinjin seiyuu too but knowing from her performance as Chie in this game and Sazanka from the anime Kunoichi Tsubaki, we can tell that she's talented. Looking forward for more of her in the future

Kanzaki Adelheid. CV: Hieda Nene (@/nene_hieda)

As you might already know, she's a member from the seiyuu-idol unit, DIALOGUE＋, who's getting the most voice acting jobs lately

Tenne Miko. CV: Miyazawaki Tamako (@/miyazaki_tamako)

since most of her other voice roles below are from niche, not-so-popular games, let me list them for you:
Kirihara Kasumi - School Girl Strikers: Twinkle Melodies
Sua - Kitsune ga Boku wo Matteiru
Eve - Blaster Master Zero

Bungo Yayoi. CV: Shirahana Renka (@/renka_shirahana)

Not much to mention yet but she once voiced Sakura Misato, the main protag of BATON=RELAY

Her voice for Bungo is also incredibly cute that she's one of the most loved chara in the game. Looking forward for her future career

Moving on to 31C-butai. The leader, Yamawaki Bon Ivar. CV: Senbongi Sayaka

Hiiragi Kozue. CV: Ozawa Ari

Minase Sumomo. CV: Shouji Yuuyu (@/shoji_yuyu)

She's a shinjin (rookie) voice actress who doesn't have that much voice acting roles yet. Looking forward to her future career since she did a great job voicing Sumomo

Moving on to 31B-butai. The leader, Aoi Erika, CV: Miyashita Saki (@/SAKI_MIYASHITA)

Asakura Karen, CV: Serizawa Yuu (@/iRis_s_yu)

you'll understand it once you play the game but in short she has 2 "personalities" with completely different voice style, both by the same person

along with Tama's seiyuu, Koga Aoi, they also work as HBR radio personalities

next up, the (my head canon's) main heroine, Izumi Yuki. CV: Maekawa Ryouko (@/ryokonekousagi)

along with Tsukasa's seiyuu, Amami Yurina, they are the MC of HBR's livestream program