I can read mangas where the story is light hearted with characters like these, except I couldn't stand this one. Why? Because it tries hard to come off as light hearted (crazy idiot personalities), except it sprinkles it with real drama on top of it.
We've got a guy who abuses the main girl, who's frankly an idiot, and he's constantly stepping on her, telling insults, doing all sorts of horrible things, despite the fact that he actually kind of likes her. The idiot girl takes all the abuse, because she's an idiot of course, and a loyal puppy.
Well, scratch that loyal puppy part because neither of them are. They're idiots. I couldn't stand them.
Oh and a warning:
They cheat, both of them. I'm telling this because I absolutely hate mangas in which the characters cheat on each other. Again, this is not the kind of stuff they should have in a manga that was supposed to be light hearted and crazy fun, because the mangaka dragged the manga down with these realistic elements. It doesn't match at all.
However, I do recommend the two extra chapters at the end, because it's about the main character's cousin, who was in love with her all this time. It's a story about how he finally gives up on her and finds new love. Now that's the kind of story that fits the mood and art. Not the main one which is crazy bad.
So read the two extra chapters at the end, then move on.