To make it simple, it's just like blood type. But it much more annoyying because they put people on special class or lower class just because of the type they born with.
---Alpha: leader, high class, special ability, usually rich, have power.
---Beta: the commoner, normal people.
---Omega: Lower rank, can give birth both male and female, have period called 'heat' but it affected people around them and make them horny, usually they all freaking pretty and rare so everyone (futhermore alpa) kind of fighting each other to bind and mate with them or they get raped alot (this depend on the story setting).
hope it helped.
HAHA+ Same when I first saw. (≧∀≦)
There're an Eng explanation at the begining of these two.
http://www.mangago.me/read-manga/abarenbo_honey/
http://www.mangago.me/read-manga/kashikomarimashita_destiny/
My first time reading 'omegaverse'? >< I'm still confused with alpha beta and omega. ._."
First time saw it, it reminds me about Math. LOL. ><