It's the opposite of a harem. Instead of the hero being courted by a group of female love interest, it's the heroine that is surrounded by a group of MALE love interests.
I’m fine with reverse harems, but they get boring after awhile, and I always feel bad for at least one of the characters cause the MC usually always has like a favorite from the harem. It gets me so sad when they’re my favorite character too XD ;;
SPOILER
I hope they don't follow the novel and this doesn't become a reverse harem.