Square Enix in Japan working on a new smartphone game called “Flame x Blaze”. The new title will be available on iOS and Android in 2017 Spring / Summer but before it you can test it with a closed beta test version.
According to Square Enix you can test the Android version of the game between March 15 and 17, 2017 from 11:00 (local Japan time). The users number limit is not published, you don’t have to sign-up, download it and if you are lucky you can play with it.
The CBT details can be found in here: http://www.flameblaze.jp/cbt