No. 6 is one of the most beautiful, intense and realistic shonen-ai i've ever seen, and even if the manga or the novels are better than the whole anime, you still wanna see it. The art of the visuals are, literally, an orgasm for your eyes. And the best part of it it's the whole thing it's not just about the main caracters (Shion and Nezumi), there's other histories and conflicts that take the whole show and makes you watch the whole thing in just a day.
No. 6 it's not Yaoi at all, so if you're looking for two guys to demostrate their love to each other with a lot of kisses and (maybe) something more, this is not your type of anime. Whatever, they still demostrate they are in love with each other with different actions, and that's what makes you believe that, love is not all about "kiss me" or "let's have sex", it's about the feelings and, in this case, giving your life for the other.
