Jun Kamigamo initially presents as male, causing Hajime Yasaka to mistake her gender. She maintains this disguise using masculine identifiers, with only Arashi and Kaja knowing she is a girl. Her true identity is formally revealed in season one, episode five.

Working with Hajime at a cafe, Jun exhibits a pragmatic and sensible personality. She frequently shows impatience with Hajime's childish behavior and roughhousing, reacting physically by hitting or kicking him when he crosses boundaries or ignores her discomfort. Her frustration partly stems from Hajime's persistent failure to recognize her true gender despite her feminine traits, which he dismisses by calling her "not much of a man."

Jun forms a significant partnership with Kaja Bergmann, a ghost from the World War II era. This supernatural connection allows them to travel through time, requiring Jun's presence because Kaja's shyness around boys limits her connections to living girls. Jun's time travel involvement integrates her into the group's adventures and comedic situations, including an episode where she cosplays as Tuxedo Mask from Sailor Moon.

Previously, Jun had long hair, a detail visible in the anime. She possesses notable acting skills. In the second season, romantic feelings toward Hajime emerge, adding complexity to their dynamic alongside her continued efforts to balance her disguised identity with her genuine self within the group.