Nanami, a 16-year-old high school student, is a member of her school's photo club. She treasures and frequently uses her deceased father's camera, an object filled with memories that serves as a tangible link to her past and their close relationship. Her elder sister, Hitomi (18 years old), is a high school runner, defining their sibling dynamic where Nanami is the younger sister.

Following their father's death, Nanami and Hitomi navigate their shared grief while leaning on each other for support. Nanami sprints in the final foot-race of her high school athletic career. During this significant event, Hitomi cheers her on and photographs her using their father's camera, symbolizing the continuation of family bonds and memory through Nanami's participation and Hitomi's act of documentation.

After the race, the sisters visit a local convenience store. Sharing a snack there, they reminisce. This ordinary setting becomes a space for them to connect and reflect on their experiences and emotions surrounding their father's absence. Nanami's story centers on processing grief through familial support, finding meaning in everyday moments, and using photography to preserve and honor memories.