XFLAG’s mobile game Monster Strike（モンスターストライク）announced earlier today (7th February) that they would collaborate with SQUARE ENIX’s classic RPG Final Fantasy. The collaboration events are a part of Final Fantasy’s 30th anniversary.
The crossover details will be announced at the stage of XFLAG BATTLE KINGDOM at Game Party Japan（闘会議）on 11th February. The developer has also revealed a Monster Strike visual illustrated by Final Fantasy’s artist Yoshitaka Amano（天野喜孝）.
Official crossover website: https://www.monster-strike.com/promotion/ff/