This is a weird manga, that's for sure. I would say that the main genre of this manga is "Surrealism". It is clear that the mangaka has been influenced by surrealist art and thought.
The manga is a collection of somewhat independent short stories, all of containing strange, neurotic and kind of freudian dream/hallucination sequences. While the mind-fuck of this manga is interesting to watch, it's hard to know what to make of the actual stories. Sometimes it's like they don't really lead anywhere and that they are just weird instead of being actually good. Often I didn't know if what I read was funny
or sad (it was probably both). This is an interesting quality but it gets in the way of the manga being moving. Still, it varies from story to story, some of them are better.
If you're going to read this manga, don't expect an overwhelming story-line. Expect gorgeous art and surrealism.