Machiko (真知子) is the villainous central character of the 2007 adult visual novel "Chichi Binta Jigoku" (乳ビンタ地獄), aka. "Breast Smacking Hell".
Machiko is a very well endowed woman who despises other females that have flat chests. These thoughts allow her to be possessed by a demon; transforming her into "Machichiko" (魔乳子) and giving her the courage to act on her feelings. By night, Machichiko kidnaps underdeveloped girls from the streets, imprisons them inside the basement of her mansion, and subjects them to her own brand of punishment.
In the game, three girls are captured: the strong-willed Kozue, and the more timid Alice and Yuki. Machichiko insults them, puts them into bondage, and "beats" their faces and chests with her mighty breasts until they get bloody noses; an act which the villainess feels they should feel grateful for.
Towards the end of the night, the demon inside of her becomes unrestrained and she rapes the three abductees in a frenzy. The final shot of the game has Machichiko giving a warning to other females with "un-swaying" breasts that the same might happen to them.
