In 2016 Autumn going to release in Japan the new PC Browser RPG game from Vector the Regretia. The game will be free to play and the official open beta test going to starts soon but you have to sign-up for it!
If you pre-register for the OBT Regretia you will get extra gatcha tickets and you will have a better chance to roll out the Siren personal pet what you can use in the battles.
You can pre-register via the VectorGame, Nico Apps and Hangame.
More information coming soon! Stay tuned!