Akito's father is a business executive who works long hours and is seldom home. Although it seems in the beginning that he is a bad father, Mr. Hayama turns out to be a good father who was simply unaware of the bad relationship between his children because he was working too hard. After realizing Akito's suffering, and also becoming ill due to working too hard, he begins to spend more time at home. When Akito gets into various scrapes during the series, Mr. Hayama always believes in his son and supports him, even when no one else does. This could partially be attributed to the fact that he and Akito's mother were troublemakers in their younger years. Mr. Hayama is very mellow and soft-spoken, but the few moments he breaks out of his quiet mode are very funny. He takes a great liking to Sana and develops a goofy habit of talking to the TV whenever she appears  From: Wikipedia.org

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)

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Fuyuki Hayama