One of the better places to visit if you like a minimalistic design and lots of free manga comics is Nhentai. Here you'll find content in multiple languages (English, Chinese, Japanese) that fall into a multitude of different niches familiar to those that like hentai and manga.
There is an endless amount of content here, more than 200,000 porn comics with around 20-30 pages each on average, and more being uploaded each day. Quality can vary from lower resolution, and thus a lower size in the slideshow, up to high-quality stills. However, that didn't stop us from reading and enjoying some of the comics.
Hentai is well known as a good way to explore unusual sexual fantasies, so you can expect to find almost any niche or fetish among all the material on Nhentai.com that you could think of. There is shotacon, monster porn, furry action, prostitution, strap-ons, futanari or shemales, urination, BDSM, diapers, incest, and much more. It's really impressive what you can discover when you browse a website like this. To use favorites, blacklist tags, and download content with one easy click, you'll have to register, but you don't have to enter an email address.
Nhentai.com has a minimalistic layout. You can either browse on the homepage or chose one of seven items from a drop-down menu located next to the search bar. These items include a random button, tags, artists, characters, parodies, groups, and finally info. Every section has an A-Z and a Popular filter, except if you want a random comic or if you're looking at the info page. Finally, there's only one animated banner at the top of each page and a few pop-ups.
Nhentai comes recommended if you like a minimalistic design and lots of manga and hentai comics.