One day, the father brings home his new wife. She is a young woman far too beautiful for his father. Though they find it odd, the daughter and son open Kokoro to their kind and beautiful mother, and feel a drop of moisture in their motherless home. However, the stepmother's bewitching beauty hides a secret and a love poison that is enough to drive the family crazy... What kind of world awaits the family as they fall into a whirlpool of immoral pleasure after learning the truth?