Please note there may be mistakes in the translations, and parts I couldn't hear well or understand were left blank!
Feel free to correct me in the comments! (pls do it kindly)

Kaida Haru:    / @kaidaharu  
Genzuki Tojiro:    / @genzukitojiro  
Nagao Kei:    / @nagaokei  
Stream:    • 【コラボ】VΔLZオフ歌コラボ 10月編【弦月藤士郎/長尾景/甲斐田晴/に...  

Referenced lyrics:
Himawari no Yakusoku: https://yurarien.livejournal.com/1409...
Cruel Angel's Thesis: https://www.stlyrics.com/lyrics/neong...
Butter-Fly: https://www.animelyrics.com/anime/dig...
Kimi no Shiranai Monogatari: https://www.animelyrics.com/anime/bak...
Doreamon no Uta: https://www.animelyrics.com/dance/lun...
We Are: https://www.animelyrics.com/anime/one...
Fuwa Fuwa Time: https://www.animelyrics.com/anime/kei...
Kasabuta: https://zatchbell.fandom.com/wiki/Kas...