Before her death, Mae was an office lady who never had a chance to live her full life.

One day, while playing her favorite game "Cedar Willows" she died from an accidental electrocution. When she opened her eyes again she was lying on the ground covered in blood.
Struck with a painful headache she quickly understood that she was transported into the very game she's been playing and as a insignificant boss character meant to die at the beginning of the game!

[System initiating... Host detected to be injured. Activating Full Recovery}
[Recovery Successful. Welcome dear host, you've successfully activated the Dominate Dungeon Master System.]

She somehow unlocked a system and decided that she will become the bad guy who will have a happy ending even if it meant she had to kill to do it!