Kasumi

I've been looking for this manga.. Its OMEGAVERSE. So omegaverse fans out there, help me out pls...
The story was, the MC is an Omega, he pays for his meds using his body.. Like yk,,.. They're still in HS I think.. And they live in the dorms if I'm not mistaken. Then the ML (which was an Alpha) was introduced as the cousin of the jerk school Pres, which was really rich and really an asshole, the school Prez I mean not the ML.
What I remember is that, they had this game in school, where they hunt the Omegas in school grounds and you know, rape them.. (I know.. I know..) and the mc was luckily found by the ML. So, a chap or so after, we learned that the Omega MC was raped on his first heat. It happened when he's in elementary and his alpha friend, aka the ML then disappeared bec of his mom, who's sivk and hates omegas.. I think the mc told the ML the possibility of him being omega.. I'm not sure tho but yeah, he disappeared. I also remember they had a vacation somewhere in one of the school prez vacation house and that's where the MC found out that his alpha friend in elementary was the same guy in he met and now had feelings for, which he totally hate bec he felt abandoned then. I think they made a promise or something...
I don't know how far I am from the ending but, a lot of things happened after the MC discovered that his friend from elementary is the same guy always next to him. There's this in one chapter that the MC agreed on becoming school pres' mate bec he's rich. (I know,, I know..) And to get away from ML.
I think I may be close to the ending.. I just want some closure.. ╮(￣▽￣)╭
If anyone know this manga, if you came across this, or this is one you're reading currently or just finished reading, drop me in the comment..
I want to know the title of this manga...
I've check post on websites of list of omegaverse story in hoping I can find the title but nada.. No luck there..
And sry for the long post. I'm not trying to write a novel. (⌒▽⌒)