It's not a new concept but they do it pretty well. Do not act like the leads. In real life no one enjoys people who act like this. There is cool sexy aloof and there is the 'i ate paint as a child' aloof and i never figured out which the ML was. I learned to love the FL. She grew on me and i was happy to see her develop into something that was not a parody. But good god the beginning...so annoying. Maybe i was depressed and had to much free time or something. By the time season two came out i was done. I have to say though in the few episodes i did watch Nao seemed to have grown up a lot.