Lyrica is a poltergeist who making peoples who hearing it keyboard in good vibe by it keyboard music, this music have any physhical effect but are good to hear The Prismriver Sisters (プリズムリバー三姉妹 Purizumuribaa San-shimai) are three poltergeist named Lunasa Prismriver, Merlin Prismriver and Lyrica Prismriver, together appearing as the stage 4 boss of Perfect Cherry Blossom. Lunasa, Merlin, and Lyrica form the band called the "Prismriver Ensemble". They live at the Ruined Western Mansion and perform at parties and festivals. There was also a fourth Prismriver sister, named Layla Prismriver, who created the others based on her original sisters. Abilities Performing on musical instruments without hands or feet In Perfect Cherry Blossom, this is the main ability that all three sisters have been specified to have. This probably derives from the ability poltergeists have, put to specific use in performing with musical instruments. By manipulating the spirits of instruments, they're able to manipulate the spirits of notes to create sounds. Since they needn't have direct contact with the instruments, they're able to play music impossible to play by hand. Since the three sisters' musical performance is something that they have learned themselves after Layla's death, their previous abilities were probably along the lines of "moving things without hands or feet" or "making sounds without hands or feet". The former is because poltergeists in general can move things and make them float. The latter is because in the general phenomena of poltergeists, they can be heard from anywhere (a rapping noise, for example).