Cinderella Collection

Plot: Shin is a top grade student in primary grade 6. In people's eyes, she's always serious. She's a girl with poor taste, who has no interest in fashion. Half threatened by the fashion King in her class, Omone Asahi, Shin entered the Readers' model interview...! Surprisingly, she gave a stunning performance. She begins her journey to become the legendary super-model...

From ANN:

Natsukawa Nina was an ordinary "unsophisticated" sixth grader. She was top of her class and a member of the student council, but she always felt left out when compared to her highly fashionable friends and classmates. All that changed when her classmate Matsuki Asahi blackmailed her into applying for a modeling position with the popular magazine "Lollypop". After attempted sabotage by fellow applicants, Nina secured a position, and went on to make appearances on morning television, TV commercials, and even a soap opera, all while struggling with her developing feelings for Asahi.