Seigi no Mikata

15-year-old Yoko is constantly tormented by her self-centered and fiendish older sister Makiko, who works for a government office after having graduated from a famous university. But despite her ill nature, Makiko's actions tend to somehow make things better for those around her, causing others to praise her as an "ally of justice."
Because of her sister's attitude, Yoko longs to be free. She decides to get her sister married so she will move out. However her plan backfires. There is also a boy called Riku who always teases her because he has a major crush on her. He becomes one of her closest confidants.
Makiko eventually reveals her true nature to her husband, Naoki, who decides to get a divorce. Meanwhile a close friend of Riku's, Chika, tells Yoko that he is about to move away. Her friends attempt to get Yoko to confess through a live T.V. program, but her sister storms in and starts yelling at her, right before she is arrested.
A few days after Makiko's release from prison, Naoki and his parents arrive to talk with Makiko. As the divorce is about to be finalized, Makiko tells everyone that she is pregnant. The series ends with Yoko finally talking to Riku, and Makiko giving birth to a baby. Yoko is the one left caring for it.

goodmwnin everyone