The second of the Sisters of Jupiter to be revealed, Apollo is Diana's older sister and resides in Kanon Nakagawa. She is shown to remember nothing about how she ended up in Kanon's body, the original sealing of old hell being the last thing she remembers.

Apollo's personality is significantly more scatterbrained and ditsy than that of her sister, even referring to herself as an idiot when asked by Kanon about what their next course of action should be. She has told Kanon that she has gained power from the love expressed in Kanon's songs, and teases Kanon about how Kanon cherishes her memories of Keima, despite her belief that he does not remember Kanon.

(Source: Wikipedia)