Hysteria, Perversion and Demons

I'm writing a story where my main character stops his friend, a dad to a 13-ish year old boy, from purchasing some anime manga books because the main character knows the book series is too adult (sex, violence, both) for a 13 year old. The main character then recommends a different series because the story line is more appropriate for the age of the teen.

The story is the relationship between the main character and the dad, so this is a small piece of the larger story. But I know absolutely nothing about anime (or manga, obviously!) and would appreciate some recommendations of titles that would fit those categories.

Thanks!


ETA: I'm looking for currently available titles and perhaps where they are best purchased (a bookstore, a comic book store, a specialty shop, online?)


ETA2: I'm looking US-centric here.