Story: Ama no Noa... The daughter of the wealthy Amano family. She was always feared by those around her because of her selfish and arrogant behavior. (She's what they call a rich super bully.) However, the reason she ended up like this is because of "loneliness" from her childhood. Her mother went crazy and became insane because of her father's affair. Because of this, she became violent towards Noa every day. Having grown up being abused, Noa has become excited by slapping, punching, choking and whipping. Rui Otozumi... A maid employed by the Amano family. She is maternal, kind and devoted. She has endured the violence from Noa for a long time. She is a lesbian. At first, Rui acts as if she loves Noa, but it is later revealed that this was an act. Rui is the child of Noa's father's mistress. (In other words, Noa and Rui are step-sisters.) Rui was poor. Her single mother abused her. That's why she has always wanted to take revenge on her father and his family who abandoned her mother. She then infiltrates the Amano family as a maid, waiting for the time to exact revenge. However, upon learning of Noa's loneliness, her plan begins to waver...