Nakashima Mika's new song "SYMPHONIA" has been picked up as the theme song for the mobile app game 'takt op. Unmei wa Shin Akaki Senritsu no Machi wo' that's due out sometime this year.

'takt op.' is an original work by Hiroi Ouji with character design by LAM. Pianist marasy also participates as the "key pianist." Set in a world where music has disappeared, it portrays the battle of young women called 'Musicarto,' who carry the music scores of classical music and other great songs. 

The theme song "SYMPHONIA" was written, composed, and arranged by rionos. It's described as a dramatic number with lyrics that go along with the game's storyline. Below is the promotional video for 'takt op.' featuring "SYMPHONIA."