Three high school girls find themselves transported to the Ryukyu Kingdom, where they encounter Satto, the enigmatic king who rules over this island realm. Akari, Sarah, and Tsubasa quickly realize they're caught between worlds, drawn into events that seem to blur the line between history and something far stranger. As they navigate the unfamiliar landscape and customs of ancient Okinawa, the girls discover that their presence isn't accidental. Satto holds secrets about why they were brought here, and their answers lie tangled somewhere in the kingdom's past. Each interaction with the king reveals new layers to a mystery that threatens to reshape what they thought they knew about time itself. The adventure balances wonder with unease. These ordinary students must adapt to extraordinary circumstances while piecing together the connection between themselves, the king, and a timeline that seems determined to keep them. What starts as confusion evolves into something deeper as the girls confront the true cost of crossing between eras.