Muv-Luv Photonmelodies is one of two side-story collections in the Muv-Luv series of visual novels released in 2014, the other being Photonflowers*.
This mini-game was once a DLC add-on for the game Is It Wrong to Try to Pick Up Girls in a Dungeon? Infinite Combate but it is now available as a stand-alone release on PC (Steam)...