Just a guess, but maybe since Asa accepted to go on another date that kinda counts as a contract or something. Also we finally gonna to see Nayuta, is she reason of those rules?
I don't think is a justification, but is like a "revenge" plot, since she was bullied and he just sit and watch now she torment him the same way. Like she said in a previous chapter: "I like so see the person I love suffer" or some shit like that.