I n the NHK drama "Nanako to Nanao-Ane to Ototo ni Nareru Hi (Nanako and Nanao: the Day They Became Sister and Brother)" on NHK-G, Thursday at 7:30 p.m. Yu Aoi plays high-school student Nanako, who is something of a social outcast, mainly because of her attitude. Nanako's philandering father died seven years earlier, but not before he produced a son, Nanao (Yuri Chinen), with his mistress.

The mistress, Machiko, has been in prison for some time, convicted of assault. Nanao was thus deposited in an orphanage, and when Na nako's mother, Kimie (Eri Ishida), discovers this fact, she takes him out of the orphanage and has him live with her and Nanako, who doesn't like the arrangement at all. She gets annoyed about her half-brother's habit of checking people's reactions before doing anything.

Things get worse. Kimie falls ill and requires hospitalization, which means that Nanako and Nanao have to live with each other, and then one day Nanako finds Nanao eating some cake in secret and she explodes in anger.