Welcome back, Sukuna.
(Seriously, I wonder why these manga can't make sense for once. It's always the same generic main character and a party leader that harbors a DEEP hatred like no other. At least one of those the leader wanted to lick out the MC because he wanted to get all the girls in the party for himself alone. That's deplorable, but I could see that direction. Here, it's just I hate you because I do.