If you're looking for anime similar to Kemonozume, you might like these titles. All recommendations are made by Anime-Planet users like you!
Life continues as ‘normal' for Birdy and Tsutomu. Though they still co-exist in the same body, Tsutomu is able to focus on his studies while Birdy keeps up with her celebrity job and Federation Investigator duties. However, things become more complicated when a transport ship housing prisoners connected to the Ryunka incident is hijacked. The aliens on board escape to Earth and blend in with the human population, and it's up to Birdy to capture them unharmed and escort them back to headquarters. Yet Birdy soon discovers that there are other forces involved, and it'll take everything she's got to bring these criminals back alive!
When Birdy 2's action scenes kicked it, I was instantly reminded of Kemonozume. The aesthetic instantly shifted to this nifty loose/messy-looking style, and wasn't afraid to be as gory/disturbing as it wanted.
Story-wise, both are about vicious aliens/monsters in disguise as normal humans on Earth, the people in charge of hunting them down, and a bunch of other stuff.
Two of my favorites, highly recommended.
Rumi Natsumi works as a call girl for Telephone Communication Madonna, but her newest client may be the strangest she's had to chat with; his name is Ryo Sugiura, and he has an unfortunate problem: when he gets turned on, he turns into a monster - literally! Rumi is determined to help Ryu get his condition under control; but when one of Rumi's classmates finds out about their situation, things turn dangerous, fast...
When Utsutsu and Yume were young, they were physically and emotionally abused by their sadistic father; and now that they’re older, Utsutsu swears above all else that he’ll protect his little sister at any cost. So when the girl is infected with the mysterious Pupa virus, causing her to turn into a terrifying monster that eats anything around her, the boy does the only thing he can: he offers his sister his body and flesh to consume. He won’t die, for Utsutsu was also infected with the virus, giving his body the superhuman ability to regenerate from any wound, and making himself the the perfect food source for his beloved sibling. Though nefarious researchers and doctors are studying their every move, Utsutsu will do whatever he can to keep the pupa inside of his sister from emerging and killing them all.
I'm making this recommendation based on both shows have a horror tone, surreal imagery and bucketloads of gore. The plots of these shows are completely different but Pupa has nothing going on beyond censored gore and surreal imagery anyway.
Kemonozume is the superior anime in ever sense of the word. It's got a better plot, better characters, the gore isn't censored to hell and back, and the surreal imagery actually has a point other than being pointlessly spooky.
If you liked Kemonozume for just its gore and generally weird moments then you might possibly find something to like in Pupa, just watch out for the fish guts those are really realistic.
Shinta Mizumura's seemingly normal life suddenly changes when Lilith Kishimoto, a beautiful half-human, half-vampire girl, transfers to his school and surprises him with an unexpected demand.
Both male protagonists are decendents of monster/vampire slaying families. They fall in love with a monster/vampire(half) girl who they are allegedily are mortal enemies with.
In Holy Knight, the half-vampire wants to bear a child of the male protagonist, because of his genes and who he is.
In Kemonozume, the monster girl truly likes the male protagonist, and learns later that he is a monster slayer from the warrior faction.
I very much enjoyed Holy Knight, if you did too check out Kemonozume! Holy Knight is an OVA and short, but does have a manga! Kemonozume is an older anime, however I remember how fantastic the story was when I watched it, so if you liked either animes, check out the other!