I too was worried that this anime was going to be creepy or try to glorify incest, but it isn't like that at all. The relationship between the brother and sister is 100% platonic, and the only thing particularly creepy are the occasional fan-service bits and maybe the middle school girl's obsession with porn (Based on the middle-schoolers I know, it seems realistic, but I don't doubt that some people might be bothered by it...). Other than that completely awesome and hilarious. This show is basically about a brother and sister becoming close to each other, and all the friends they have and meet along the way. Adorable!