Emilia, a 12-year-old girl who claims to be from another planet, is finishing a diorama for a presentation on the Boötes Void, which she is set to present at school the next day. The following morning, after an unsuccessful search for her lost cat, Emilia’s presentation ends in disaster when she suffers a panic attack. That same day after school, she learns that Julieta, her frequent bully, is throwing a rooftop party to which Emilia is not invited. Later, after an argument with her mother, Emilia discovers that Planet X will pass near Earth that very night. Determined, she plans to sneak into the party in hopes of finding a way back to where she belongs.