Tsubaki, who was once an office lady, was reborn with memories of her previous life carried with her.
At the time she was still four years old, she started to recall that the world she was living in was actually the world of a Shoujo Game after heard what her halfsister, who Tsubaki believes was a reincarnated person like herself, said to her.
In the game, her halfsister was the daughter of the lover and the Heroine. While Tsubaki, was someone who would always bully the said Heroine of the game, she was the Villainess. Moreover, every route of the game would always lead to the endings where the Villainess would take her own life.
— However, the current world she lives in was far different from the world of the Shoujo Game.
This is a story about a girl who believes she can rescue her mother from her impending doom and protecting her cousin, the main capturable characters, from the hand of the Heroine.