Higeki no Genkyou to Naru Saikyou Gedou Last Boss Joou wa Tami no Tame ni Tsukushimasu.

At eight years old, Crown Princess Pride Royal Ivy remembers her previous life and realizes she has been reincarnated inside a game she once knew well—not as its heroine, but as the tyrannical final boss whose cruelty will cause countless tragedies before she is eventually killed. Knowing what her future self is supposed to do, Pride refuses to follow the same path.

Pride possesses overwhelming power, royal authority, and knowledge of events yet to come, all the tools that once made her an ideal villain. Instead, she uses them to protect her younger sister, her adopted brother, and everyone she knows is destined to suffer because of her. Every life she saves pushes the world farther from the story she remembers, yet Pride remains haunted by one fear: that the monster she replaced may still be waiting somewhere inside her.