CRIMSON HERO (Beni-iro Hiro), by Mitsuba Takanashi. First published in 2003 and first published in North America in 2005.
PLOT:
Nobara is a 15-year-old and heir apparent to her mother's traditional Japanese restaurant, but she couldn't care less. While her younger sister Souka is the very picture of femininity, but all Nobara wants to do is play volleyball. Her obsession leads her to Crimson Field High School, which is renowned for its volleyball team...its men's volleyball team. Nobara is determined to play, though. She's so determined that she's even willing to go so far as install herself as house mother to the men's team in the hopes of winning them over to play on their team, all in the hopes of pursuing her dream.