AltPlus updated the official website of the new Yuuki Yuuna smartphone game which will be available from 2017 Spring in Japan on iOS and Android as a basic free to play game.
On the new updated website you can listen the first voice samples of each main characters from the game. (Totally 19 characters)

The first pre-registered users number information also arrived, according to AltPlus the game reached the 150 000 pre-registered users which means you will get the 200 gems and the extra item packages when the game release!