Rosella Smith lives a normal life on Earth despite a war raging worldwide. The tension reaches its peak as bombs rain down, causing chaos and panic. As Rosella tries to get to safety, she is pulled into a strange portal while on the cusp of death. Soon, she appears in the rainbow-colored medieval world of Dorthos.

Akuna, the dragon that pulled her from Earth, tells her that despite just escaping, she must now save her new home. Her destiny will require her to claim the throne to restore the magic that keeps the land alive. However, she learns that she cannot simply sit on the throne without solving the many problems that have plagued her kingdom for generations. Confused and shell-shocked, Rosella must navigate a deadly world with a grumpy dragon by her side.