Muv-Luv Girls’ Garden is a free-to-play gacha / auto-battle RPG (role-playing game) developed by KMS and published by Exnoa, for PC (via DMM) and Android in Japan.
It is positioned as a new, approachable spin on the Muv-Luv franchise: not strictly a sequel or remake, but something that adds a different flavor (school life + battle + gacha) to attract both newcomers and existing fans.
