Oshi no Bishoujo ni Kokuhakusareru Hanashi

Yuzu's classmate Rika Sasaki is a cool and beautiful girl, and Yuzu idolizes and admires her. Yuzu was hoping to take advantage of entering high school to transform herself and become more fashionable. But she wasn't having any success on her own, so she asks Rika, her idol, to be her fashion guru. However...
(Source: Amazon.jp, translated)