One day, Maki, who had married Shizuka's brother, seemed perfect in every way—flawless at housework and seemingly ideal, living happily with both siblings. However, she suddenly changed overnight, transforming into a demonic wife. As the truth behind her marriage to an unattractive man slowly comes to light, Shizuka gets caught in Maki's control. Any resistance is met with furious shouting and relentless torment—just how far will Shizuka be forced to fall?