Dimension follows Rain, a teenage girl with a rare gift: each night in her sleep, her soul crosses the boundaries of worlds and enters the dimension of lost souls from the past. In this shadowy realm, souls who met tragic ends plead for her help to unravel the mysteries behind their deaths and free them from the chains of vengeance toward the light.
Everything changes when Rain meets Bentley, the soul of a young man who has been trapped in the dimension for over a century. With Bentley's unwavering support, Rain ventures into dark secrets, faces the dangers of restless spirits, and forms a deep emotional bond one that transcends the divide between life and death.
In this journey filled with drama and mystery, Rain discovers that saving the lost souls also means confronting her own fears... and risking her heart for someone she can never truly have.