こどものおもちゃ [Kodomo no Omocha] Series by Miho Obana, Barbara Chies

12-year old Sana Kurata is used to getting what she wants - even in love. Ever since she hired her manager, a man 10 years her senior who she calls her "gigalo," she thought it was true love. When Rei shows his feelings for a woman his own age, Sana realizes that Rei's feelings for her are anything but romantic. Sana has romantic problems at school, too, as now former-bully Hayama and mama's boy Tsuyoshi are vying for her affections.

Take one young actress used to getting her way, add a handful of ruthless bullies, some humorous twists, and a plastic toy hammer, and you've got the recipe for one crazy story Kodocha follows the antics of Sana, a spoiled 11-year-old TV star, and Hayama, a 6th grade Machiavelli who terrorizes both his teachers and his classmates. In their classroom war of wills, Sana and Hayama find there is more to both of them than meets the eye.