In the year 2999, humanity is divided into the Terra and Ness factions, locked in a war fought by starships. One of the most prominent pilots is the cocky teenager Yamamoto Yohko. During a mission, she and her crew are sucked into a temporal anomaly, reminiscent of the one in Star Trek, that sends them back to our time. With amnesia, she thinks she is just a typical high‑school student until a series of events brings her back aboard her ship, the TA‑29. She returns to battle with newfound allies, facing a conflict that oddly resembles an arcade game, complete with 100‑yen ignition costs.