Amako would never had thought this was the last time she took the train, searching for inspiration for her next game scenario. Unfortunately so, when the train derails she loses her life.

Though instead of vanishing, she’s reincarnated in the realm of Kingdoms of Sins, a fantasy RPG game she was lately working on. Under the features of the Saintess, originally doomed to meet her death in the game’s prologue, she meets Tyffeon. Her favourite character.

While she doesn’t miss the opportunity to tease him, the original scenario soon turns upside down. The Hero supposed to save them gets killed before his quest truly begins.

The five kingdoms threatened to get engulfed by the weight of their sins, will Amako achieve to find a place in the world she imagined?