The cast (from left to right):
Akasaki Chinatsu (Izumi Hashima)
Yahagi Sayuri (Michiru Hyoudou)
Yasuno Kiyono (Megumi Katou)
Matsuoka Yoshitsugu (Aki Tomoya)
Haruna Luna (Singer of Saekano OPs and Glory Days!)
Oonishi Saori (Eriri)
Kayano Ai (Utaha Kasumigaoka)
Event : Saenai Heroine no Sodatekata Fes. ~glory moments~
Full Vid of Event: https://www.bilibili.com/video/BV1FV411n7ZM?from=search&seid=11257513387151964217
MAG.MOE - The MAG, The MOE.