- For the Uber Rare Set with similar name, see Girls & Monsters: Angels of Terror (Gacha Event).
GirlsMons (ガルズモンズ, Garuzu Monzu) was a Japanese-exclusive puzzle-based combat game developed by PONOS. It was released for Android on September 25th, 2016 and for iOS on October 7th, 2016. The game shut down its services on January 19th, 2017.
As a token of appreciation for the players that played the game, Undead Cat (死にたてにゃんこ, Shinitate nyanko) was added to Nyanko Daisensou as a Special Cat. Undead Cat can be unlocked by accessing this URL. The URL is available in the help menu (in the 豆知識 tab) from the title screen from Version 5.7.0 onwards.