One day, I suddenly gained a younger sister. To the rest of the world, she’s just a talented girl, but I know the truth that no one else suspects.
She is the legendary hero who once saved the world—the "Reincarnated Sword God."
In a world where I’ve possessed the body of a minor villain destined for a miserable end, my only chance at survival is to navigate the dangerous waters of this family and manage the monster living under my own roof.
The problem? She’s not the only one with secrets, and the "User Manual" for this hero is far more complicated than I ever imagined.
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