millsage is a band created in the multimedia franchise "BanG Dream!".

The members are:

Hotaru Shiomi, Keyboard & Vocals (CV. Ria Yakushiji)
Natsume Izawa, Guitar (CV. Chiharu)
Nagi Kotohira, Guitar (CV. Asaki Yuikawa)
Mahoro Hamasaki, Bass (CV. Yurie Igoma)
Houka Izumi, Drums (CV. Hinano Sakikawa)

The group was announced in conjunction with the mobile game "BanG Dream! Our Notes", on January 12, 2026. Ria Yakushiaji's involvement was announced the same day, while the identities of the other members were announced during the last week of April 2026. Their debut single was released on March 2, 2026.