The Azure Messenger
Osamu Dazai's Entrance Exam - Chapter 1
Sasaki was a young woman in her twenties, she had long dark brown hair and grey eyes. She wore a white bolero jacket over a cream shirt, with a light grey skirt and dark tights.
Sasaki was the Azure King's girlfriend. After his death, she took the role of the Azure Messenger to carry on his ideals and take revenge on the Detective Agency (specifically, Doppo Kunikida) whom she blamed for her lover's death.
In episode 7, Kunikida was called to an abandoned building by Dazai. After arriving Kunikida was informed by Dazai about their current situation, and how he emailed who he thought to be the 'Azure Messenger' to meet up with them in the aforementioned abandoned building. Coincidentally after Dazai brings up the meeting with the supposed azure messenger Rokuzō enters the room and Kunikida assumes he is who they're waiting for but it turns out Rokuzō only hacked into the email Dazai sent and came to see who the azure messenger was for himself. While talking Rokuzō notices Sasaki behind them in a dark doorway holding a gun. She fires at Kunikida but before the bullets connect Rokuzō pushes him out of the way and gets hit instead. After Sasaki confirms that she is the azure messenger and reveals her reasons for her actions she asks Dazai to shoot her for she is "Tired now". She says this knowing however that he can't since she lowered her gun making it excessive force and Kunikida is there as a witness to it. Dazai acknowledges this and drops his gun into the hands of Rokuzō who shoots Sasaki dead before saying "The Azure King killed my father. Good Riddance". After this, he passes away from the injuries he sustained.
- In real life, Sasaki Nobuko was Kunikida Doppo's first wife. After a whirlwind romance that involved virtual elopement and the defiance of her parents, Sasaki Nobuko married Kunikida Doppo, only to leave him 5 months later.