Hana-Kimi is a popular manga series that follows the story of Mizuki Ashiya, a Japanese-American girl who disguises herself as a boy to attend an all-boys high school. Mizuki's decision to cross-dress leads to her facing bullying and challenges as she tries to keep her true identity a secret. The manga explores Mizuki's determination to fit in and the friendships she forms along the way. Hana-Kimi addresses the issue of bullying within the context of Mizuki's struggle to maintain her disguise, highlighting the importance of acceptance and authenticity.