Remi is one of three modern children transported to prehistoric times by an alien intelligence troubled by humanity's diminishing empathy. She journeys alongside Jun, a boy respectful of nature, and her younger brother Chobi. An immediate romantic connection sparks between Remi and Jun upon their first meeting on a beach before their displacement.

Experiencing the Mesozoic era and Ice Age as part of the trio, Remi witnesses significant prehistoric events like volcanic eruptions, dinosaur extinctions, and the rise of mammals. Her specific actions or reactions during these events remain undefined beyond her presence. The group collectively encounters a baby Triceratops, Zhu, who survives a Tyrannosaurus attack that kills his siblings and mother. Zhu imprints on the children as a foster family, though Remi's individual interactions with him are not detailed.

Her relationship with Chobi features his tendency to follow and mock her, particularly concerning her interactions with Jun. This sibling dynamic continues throughout their prehistoric ordeal.

Visually, Remi maintains a consistently neat and untarnished appearance despite traversing harsh and dangerous environments across multiple geological eras. Her clothing and hair remain pristine. She displays minimal distinct personality traits or emotional reactions, maintaining a largely passive or observational role during the group's experiences.