Jun Kamigamo is a main character who works as a clerk at the tea house called Hakobune. During the summer, Jun wears the male uniform of a middle school student while on duty at the cafe, and is generally perceived by others as an androgynous and delicate young boy. In reality, Jun is a girl who keeps her true gender a secret, presenting herself as male for reasons that become clear over the course of the story. The misunderstanding originates with her colleague Hajime Yasaka, who mistook her for a boy on the day they first met, and Jun has continued the pretense ever since. Initially, the ghost Arashi and Jun’s partner Kaja Bergmann are the only ones who know her secret, though it is eventually revealed to others, including Arashi and Jun's sister. Hajime himself remains unaware of her true identity despite numerous hints, often attributing her feminine traits to her simply being "not much of a man".

Personality-wise, Jun is pragmatic, sensible, and generally does not engage with the childish or crude behavior of her coworker Hajime. Jun tries to avoid uncomfortable situations and prefers to follow social norms, which makes her role as a secret-keeper a source of constant tension. She is easily frustrated by Hajime's lack of awareness and his rough treatment, often reacting by hitting or kicking him when he crosses personal boundaries. Despite her composed exterior, she is easily terrorized by insects like spiders and cockroaches, leading to destructive outbursts. Jun also has a peculiar habit of not paying attention to what she wears after taking a bath, which has led to some awkward situations.

A key aspect of Jun's role in the story is her supernatural partnership with Kaja Bergmann, a ghost from the World War II era. Jun serves as the living connection, or partner, that allows Kaja, who is shy around boys, to travel back in time to the past. Their first involuntary time jump to Japan during the war proves to be a terrifying and traumatic experience for Jun, as she is horrified by the danger and destruction she witnesses. Because of this, she is reluctant to repeat the process, though she sometimes undertakes smaller time jumps to help Kaja or at the request of others.

Throughout the series, Jun's key relationships evolve significantly. Her dynamic with Hajime shifts from simple frustration to a more complex and romantic one over the course of the second season, as she becomes conscious of him and blushes in his presence. This creates internal conflict for Jun, as she must balance her developing feelings with the need to maintain her disguise. At home, she lives with her older sister Kyoko, a model, and is responsible for most of the housework. Kyoko is aware of Jun's secret and occasionally teases her about Hajime. Jun herself also works as a model, a profession that highlights her high-level appearance, and she has model friends and colleagues who appear in the story.

In terms of abilities, Jun has notable acting skills, which help her maintain her male persona. She also possesses a unique supernatural ability, forming a time-traveling connection with Kaja. The character also possesses remarkable acting skills and has a professional modeling ability.