Here on Earth explores the lives of three youths who come together for one fateful summer. Kelley Morse (Chris Klein) is a brash and arrogant student at a posh private school in a small town. He becomes rivals with Jasper Arnold (Josh Hartnett), a local boy. The rivalry escalates until the two accidentally destroy a local diner while drag racing. The court finds an ironic punishment for the two boys; they must aid in rebuilding the diner they have ruined. Additionally, the judge forces Kelley to board with Jasper's family for the duration of construction. During the construction, Kelley starts a relationship with Samantha Cavanaugh (Leelee Sobieski), a local girl Jasper also covets. Their romance takes a fateful turn when Kelley learns that Samantha has a chronic illness and only a few months left to live. Kelley decides to stay in town with Samantha for the rest of her time here on Earth.