When a city vanishes without a trace, Takuya, a pragmatic courier, crosses paths with Yuki, the sole survivor. Bound by a cryptic message from Yuki's missing father, they venture towards the enigmatic Lost city. Amidst startling revelations and daunting challenges, Yuki faces a reality beyond imagination. As they confront the emotions of the forsaken, a clandestine faction pulling strings in the dark, and a web of deceit, Takuya and Yuki forge an unexpected connection. Through their odyssey, once strangers become allies, delving into the enigma shrouding the Lost city.