Why do you want to get rid of them? You can't think they're THAT bad since you actually have them already. At least you liked the manga at one point in life.
Who knows- maybe you'll start like Naruto again, and then it won't exactly be cheap to buy new books. I would recommend you to just place them in a box or something until you start like Naruto again and stuff them away somewhere if you don't want them in your book shelfs at the moment, instead of getting rid of the books.