Men of Tattoos consists of six small stories, four of which deal with the yakuza and a "scam artist", while the last two are about a gay university student in love with his womanizer friend.
The art of Yuiji Aniya is extremely beautiful and very distinctive. Everything has been drawn with great care. However, some people might find the style disturbing in places, since Aniya is rather fond of drawing bodily reactions that cause a lot of drooling, tears and sweat. Blushing, shivering and bleeding are also drawn with relish. Personally I have to say that I did like this very much because it felt honest and I do think that there's is a lot of beauty in what is usually considered ugly or somehow shameful. However, if violence or tragedy are things you do not find very appealing, it might be best to leave the first four stories alone. The sex is also rather explicit in all the stories.
The yakuza arc is very sad, though there is a happy ending of sorts, at least to some characters. I really enjoyed its originality and the small surprises Anya had gleefully planted to explode in your face. There is a great deal of humour in the story, despite it being about violent men in a violent world.
The story of Ahna and Haruno, the two university students, is very sweet and somewhat supernatural. There is one (friendly) ghost - Haruno, to be exact (and this is not a spoiler since it's something that comes in on the first page)- who "haunts" poor in-love-but-too-shy-to-admit-it Ahna. This arc is not as violent as the first, but that might be because of Haruno's ghost status (Ahna's hands - and other body parts - do go through Haruno's ghost body rather disconcertingly in all the excitement).
One additional thing I found very pleasing was that Aniya didn't care about the "obligatory" seme-uke dynamics so prevalent in yaoi-manga, but just did what she considered best.