Arima Kana is a prodigious child actress and a childhood acquaintance of Aqua and Ruby, though her popularity has waned by the time of the main story. She is also the former center of the revived idol group B-Komachi. She is friends with Aqua Hoshino (a boy) and Ruby Hoshino (a girl). She likes Aqua.

Hi, I'm Arima Kana, nice to meet you~