Asako is a popular actress. She was also Rei's girlfriend who dumped him to concentrate on her acting career, which partly triggered his downward spiral to homeless bum. She did not know that Rei would end up homeless. When she finds Rei again, she wants to get back together, but Rei says that he belongs to Sana now, and can't be with Asako until Sana grows up. When Sana realizes (with Akito's help) that Rei is not her "pimp" nor her boyfriend, Asako and Rei reunite. Asako continues to recur until the end of the series.

(From Wikipedia)

Sana Kurata has a charmed life. Not only is her mother is a famous, award-winning writer, but she's the star of the hit TV comedy "Child's Toy" while still in the fifth grade. But Sana's biggest concern is Akito Hayama, a pint-sized hellion who's organized the boys in their grade-school class into a mass of unending noise and violence. With the help of Rei, her manager, chauffeur and "pimp," Sana is determined to win back control of the classroom from her new arch-enemy. But as her crusade continues, Sana moves further into Akito's life, and finds that he might not be entirely bad...or entirely safe.
 
(Source: Anime News Network)

Sana Kurata, a child actress, faces many problems in her classroom, including a major one - her bullying classmate, Akito Hayama. Sana's outgoing and friendly nature leads her to work towards correcting all of the problems around her. Her 'meddling' irritates Hayama but at the same time captivates him, just as Hayama's gloomy nature irritates Sana and compels her to change him. As these two opposites attract each other, they face many hardships which bring them closer to a mutual understanding.
 
(Source: Anime News Network)

The Kodomo no Omocha OVA is a thirty-minute animation video that was made before the TV series. It covers the first volume of the manga, so it's equivalent to TV episodes 1-6. It relates Sana's troubles with Hayama at school as a result of the "oyakodon baka" situation and culminates when Hayama's dad and sister realize their mistakes thanks to Sana's efforts. 
(Source: AniDB)

Asako Kurumi