Honoka Shirahama (白浜 ほのか Shirahama Honoka) is the younger sister of Kenichi Shirahama whom she cares for greatly that she often competes with Miu Fūrinji for his attention.
Miu's Kiss! - Kenichi: The Mightiest Disciple (Season 1, Episode 25) | Apple TV.
Rimi stated that Miu was able to control her ki was because of her love for Kenichi. In the Epilogue, Miu finally achieves her dream of becoming a beautiful bride and marries Kenichi. The two are now happily married and have a daughter with her husband who is now a master class fighter and successful novelist.