Yuta Ito is a 12-year-old middle school student with a deep passion for movies and filmmaking. After receiving a smartphone for his birthday, he begins constantly recording his daily life, specifically focusing on his sick mother. He is a sensitive boy who uses his camera as a shield to process complex emotions and distance himself from painful realities. His penchant for adding a pinch of fantasy to his creations defines his artistic style but alienates his peers.

Eri is a cinephilic middle school girl who becomes Yuta's closest friend and creative collaborator. She sets up a projector in an abandoned building where she spends hours watching and analyzing films. Unlike Yuta's classmates, she appreciates his unconventional documentary style and recognizes the emotional truth hidden behind his editorial choices. She takes on the role of his cinematic mentor, explicitly teaching him about story structure to help him craft a better script for his next project.

Yuta's Mother is a terminally ill woman who spends much of her time in the hospital. She works as a television producer and understands the power of curated media. Following her diagnosis, she requests that Yuta document her remaining days, framing the project as a way for him to remember her. She dictates exactly how she is filmed, presenting herself as a brave survivor for the camera.

Yuta's Father is a quiet man who works long hours to support his household. He takes a passive role in family dynamics, observing Yuta's obsessive filming rather than interfering. Despite his stoic demeanor, he possesses an insightful perspective on art and creativity, believing that a storyteller must share the emotional pain they inflict on an audience.