A Girl on the Shore

A high school student at the center of the story, Koume enters a casual sex relationship with Isobe. She moves between affection and detachment as she navigates desire, jealousy, and a need for something more meaningful. Her actions—including deleting the photos she discovers—show a longing for agency and true connection, culminating in the sea as a symbol of something bigger.

A teen haunted by his brother's suicide, Isobe uses a casual relationship with Koume as a way to cope with grief and detachment. His emotional volatility and willingness to push boundaries drive much of the film's conflict, including episodes of anger and isolation. His pursuit of connection clashes with a search for meaning and stability, often leaving others wondering where he stands.

The school's top baseball player and Koume's childhood friend, Kashima acts as a focal point for rumors and rival feelings. He confronts Isobe after gossip spreads, revealing the tension between loyalty, pride, and unresolved affection. His presence underscores the competitive social dynamics of the school environment.

A fellow student within the school’s social and sports circles, Otsu observes the unfolding drama and participates in peer dynamics. While not the main focus, his presence contributes to the atmosphere of school life and the spread of rumors. He embodies the everyday peer whose actions ripple through the group.

Misaki is part of the circle around Isobe and Koume, associated with riskier behaviors. He attempts to push Koume toward cannabis and kissing, illustrating peer pressure and the influence of group norms on teenage decisions. His actions intensify the moral and emotional stakes for both leads.

A classmate within the same social milieu, Mitsuru is part of the surrounding network that informs rumors and interactions. While not the central driver of the plot, his presence helps frame the broader social texture of the school setting. He contributes to the sense of a tight-knit, sometimes claustrophobic, teen world.

The girl depicted in the photos on Isobe's SD card, Akira becomes the object of Isobe’s envy and curiosity. Her image and the possibility of reaching her high school life propel Isobe's actions and create a thread of mystery about identity and connection. She represents the external world that intrudes into their intimate sphere.

A symbolic figure tied to the film's seaside imagery, this character is linked to the beach setting and the idea of something larger beyond ordinary life. Though not central to the plot's main actions, she strengthens the shoreline motif as a space of revelation and longing. Her presence reinforces the sea as a gateway to meaning for Koume.