arinu, lunasa prismriver, lyrica prismriver, merlin prismriver, mystia lorelei, touhou, light purple hair, 4girls, alternate costume, animal ears, bamboo, bamboo forest, bare shoulders, blonde hair, brown hair, cello, closed eyes, double bass, dress, female focus, fireflies, forest, grass, hair ornament, instrument, keyboard, keyboard (instrument), multiple girls, music, nature, no headwear, pink hair, rock, short hair, singing, sitting, skirt, smile, trumpet, wings