Or do you prefer "Graphic Novel"?
Either way, I'd like to discuss them. Because I'm not very familiar with comic book territory.
I prefer "graphic novel", myself, simply because it's so universal. Whether it's a comic book or a manga, it's easier to wash away preconceived notions when you call them "novels".
On the Eastern end of things, I have a weakness for a couple titles that are very, very lengthy, and always adult.
Berserk comes to mind immediately, but its author, Miura Kentaro, has a penchant for taking breaks from it for months- if not years -at a time! The fastest he ever churns out chapters is once a month, so while it may keep you busy for a long time (each chapter is pretty lengthy, and packed with detail) once you DO catch up, as I have, you'll be waiting around a loooooong time to read anything new. XD But I can't stress enough that it's a GREAT series. It's essentially the
Game of Thrones of manga; lots of blood, lots of boobs, and plot armor is nigh non-existent! =D
I've just been exploring a bunch of other titles, recently, and while most of the ones I end up following do entertain me, few I'd recommend. For instance, what "some" users fail to understand is, just cause I love and follow
One Piece does NOT mean I'll recommend it. You gotta be a particular breed to be able to handle it. One necessity is the maturity to get over the fact that the art is very unique, and get past the fact that it's probably good and give it a chance. Other necessities are being able to read an ongoing story that has no end in sight (I know plenty of friends who can't stand series that are "ongoing" and they want to watch something that ends with closure after 1 or 2 seasons), having a stomach for graphic depictions of violence and gruesome mutilation, maturity to handle some very dark themes, and so on. Just the size alone is enough for me to say "I shouldn't recommend this to anyone unless they say they are all of these things on their own, AND already interested in OP". But there's other titles that, in my searches, I WOULD recommend, because I feel like their list of "necessities" is relatively smaller.
Nozoki Ana, for instance, requires that you can handle seeing boobs every chapter without stopping to reach for the lube. You also gotta be able to handle crying, and if you suffer from deep depression, you might wanna skip it. Besides those things, it's a great series, one of the only romance manga I've read that I considered ENTHRALLING, and I'd recommend it to anyone looking for a story that has a nice length to it with an ending, nice art, slice of life story that has some unexpected turns (though no "mind blowing twists") that will keep you engaged and wanting more up until the final chapter. Great story, it's penultimate chapter pushed me into a really dark place, emotionally, because of how a story like that can fuck with depression, but I'm real glad I read it, in the end. =)