It's exactly what it suggests: a collection of short, wordless hentai manga. Simple stories with fun premises. A bit more focused on dubious consent than I personally prefer, but even so, it's cute and fun.
This book is full of visual comedy that I think could have benefited from longer setups, but other than that I don't really have any complaints. I might pick up the second book at some point.
This work compiles a number of short, typically unrelated, 2-page hentai works. The basic formula used is that the first page sets up the joke and the second one provides the sex scene punchline. There's a variety of different situations depicted in the work. My personal favorite was the one with the tanned girl at the gym. There's two different art-styles used in this work though. About 2/3's of it have a more traditional anime style while the last 1/3 or so has a deformed style like on the cover. I personally liked the more traditional anime style, but, regardless, I enjoyed most of the stories for both styles.
I knew about these works before this released. I followed Sueyuu who would post these short comics on his twitter or pixiv. Good money should not go to waste because this compilation shows great stories with sex in a matter of 1-2 pages no less. My favorite was the farmer and hitchiker who ended up having sex in a motel after the girl shoots up heroin.
Jokes aside, the silent Omnibus is a fun little read, full of short stories that your brain can fill in the gaps of. I wish a few of them were a page or so longer, but that might go against the spirit of them.