"Beniiro Hero" ("Crimson Hero") by Takanashi Mitsuba 12 volumes-ongoing
Volleyball is everything for Nobara that she'd rather be dorm maid than inherit the ryotei or restaurant. This is a half reverse harem because at the start she's serving the top 4 players of the boys' volleyball team and as the manga progresses she was was able to form her own female volleyball team. "Crimson Hero" has a winning combination of comedy, volleyball action and romance. The art is beautiful too. The heroine is tomboyish but a real beauty. I've put off writing it since it's not a full reverse harem but all I can remember is that I enjoyed it. I've read the latest chapter, and it's looks like there's a new set of reverse harem.