In 1999, Jun lives with her parents and her younger brother, Davis Motomiya.
Jun is six years older than Davis Motomiya, and apparently likes to spread bad rumors about him. She is friends with Momoe and Chizuru Inoue. Jun commonly bugs Chizuru about the Teen-Age Wolves's whereabouts since she is in the same class as their vocalist, Yamato "Matt" Ishida. Jun and Momoe are in the same class and are big fans of the Teen-Age Wolves.
By the spring of 2003, she has become a DigiDestined and needs help in the Digital World.