This is a corner of a quiet residential area in the morning. Ayako smiles gently as she sees off her only daughter, Moe, at the front door of their home. Her appearance is that of a perfectly neat and elegant mother.

Ayako looks like a slightly overprotective but otherwise ordinary mother. However, as she turns on her heel and steps back through the door, a hint of madness lurks in her expression. She sits on the living room sofa and begins to apply makeup and dress up, even though she has no plans to go out. It is preparation to become a seductive, alluring figure designed to flatter men—a look ill-suited for an ordinary single mother.

After finishing her bright red lipstick, Ayako carefully checks her makeup in a hand mirror before operating her smartphone. On the screen are profiles of not only the teachers at Moe's school but every single student. It is information gathered from the 'pawns' Ayako has established within the school. A message arrives from one of those pawns. It contains detailed information about Moe's new homeroom teacher and classmates for the new term, which should have been top secret.