An orphan inherits his father's last mystery instead of answers. Yukino Yayoi shows up with secrets that rewrite everything he thought he knew, and she's not telling him which parts are true. This is a show that treats a kid's confusion as the real story, not something to resolve by episode three.
An ordinary elementary school boy's life shatters when his father's experiment destroys their home, leaving Hajime orphaned and adrift. He finds refuge with his astronomer uncle, whose observatory becomes his new world. There he reconnects with Yayoi, a girl from the local ramen shop who now assists his uncle with his research. What begins as a shy crush quickly complicates when Hajime discovers Yayoi harbors an impossible secret: she is the Millennial Queen, an emissary sent from the distant planet LaMetal to observe Earth. As the 1990s wind toward their end, Hajime must grapple with the reality that the girl he cares for belongs to another world entirely. Their growing bond becomes entangled with cosmic stakes and shadowy forces that threaten both planets. Mystery deepens as Yayoi's true purpose unfolds, forcing Hajime to question what her presence on Earth really means. This is soft sci-fi drama that balances intimate character moments with larger questions about duty, connection, and whether destiny can be defied. It asks what happens when two people from fundamentally different worlds try to understand each other anyway.