
Running in the english server from 13/10/2020 to 2/11/2020, the tactical gacha mobile video game girl's frontline had a collab event featuring gunslinger girl, giving a new in-game story and allowing the players to use henrietta,rico,triela,angela and claes in-game.
images

wallpaper released by mica team, girl's frontline developers
videos
Girls Frontline x Gunslinger Girl Collab Story (EN)
Game Story (without the actual gameplay part)