A very shy and insecure young woman.   ~!She gave birth to Sana when she was only 14. In the manga it is revealed that her uncle made her pregnant, and she gave birth in a bathtub. Keiko says that she was very much in love with Sana's birth father, but that he has died. When Misako finally meets her, after Keiko offers proof about her bond to Sana, she slaps Keiko and says that even animals know they have to take care of their offspring. She also arranges Sana to meet her. Sana was worried about meeting Keiko, because she was afraid that Misako would give her up; she finds out that Misako had the same worry, that Sana would leave with Keiko. After meeting Keiko, Sana and Misako conclude that it's what in the heart that defines your family, and that they are truly mother and daughter. After meeting Sana, Keiko asks if it is possible that one day Sana would come to live with her. Sana gently but firmly says that she considers Misako as her mom, although she's grateful to Keiko for bringing her into the world.!~  (Source: 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.
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(Source: Anime News Network)

Cousin of [Marina Massironi](https://anilist.co/staff/157944)

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.
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(Source: Anime News Network)

Keiko Sakai