ThreeWords said:
It depends: were the drawings of something that actually happened, or were they made up?
If they are 'real', then this is just another form of child pornography.
If the pictures are just that, pictures of something creepy that never happened, then this is merely art. Creepy, no doubt, but not actually wrong
Actually, if this the same case I'm thinking of, the Manga in question was a 'Shōnen-ai', 'Yaoi' or Boy's Love manga, basically a gay comic. That said, the characters in question in it were drawn in a rather youthful style.
It's still all a bunch of crap...I was actually surprised and dismayed to see that the guy got arrested in the end. I'll make it clear, I'm not into that stuff...but it terrifies me to realise that all it takes is to have borderline explicit content in your possession to put you away, regardless of the reasons you have it nor it being misconstrued by those outside.
And, I'm not talking about films and photographs, those are without exception wrong to have. I mean, as in this case, drawn images, and even images that may not be at all explicit but could still come off that way to the un-awares.