Here are my favorite picks for anime like Pupa. Keep in my the list is in no particular order. Enjoy the recommendations!
Tokyo has become a cruel and merciless city—a place where vicious creatures called “ghouls” exist alongside humans. The citizens of this once great metropolis live in constant fear of these bloodthirsty savages and their thirst for human flesh. However, the greatest threat these ghouls pose is their dangerous ability to masquerade as humans and blend in with society.
Based on the best-selling supernatural horror manga by Sui Ishida, Tokyo Ghoul follows Ken Kaneki, a shy, bookish college student, who is instantly drawn to Rize Kamishiro, an avid reader like himself. However, Rize is not exactly who she seems, and this unfortunate meeting pushes Kaneki into the dark depths of the ghouls’ inhuman world. In a twist of fate, Kaneki is saved by the enigmatic waitress Touka Kirishima, and thus begins his new, secret life as a half-ghoul/half-human who must find a way to integrate into both societies. [Written by MAL Rewrite]
The story takes place at a certain middle school where several murder cases take place. Kobayashi, a boy who goes to this school, meets genius detective Akechi, who comes to the school to investigate. Kobayashi takes an interest in Akechi and, in spite of his friend Hashiba’s worries, he volunteers to be Akechi’s assistant. (Source: ANN)
Based on Iwaaki Hitoshi’s science-fiction horror manga by the same name.
The 17-year-old Izumi Shinichi lives with his mother and father in a quiet neighborhood in Tokyo. One night, worm-like aliens called Parasytes invade Earth, taking over the brains of human hosts by entering through their ears or noses. One Parasyte attempts to crawl into Shinichi’s ear while he sleeps, but fails since he is wearing headphones. The creature enters Shinichi’s body by burrowing into his arm instead, taking over the boy’s right hand. It adopts the name Migi.
Because Shinichi was able to prevent Migi from traveling further up into his brain, both beings retain their separate intellect and personality. As the duo encounters other Parasytes, they capitalize on their strange situation and gradually form a strong bond, working together to survive. This gives them an edge in battling other Parasytes, who frequently attack the pair upon realization that Shinichi’s human brain is still intact. Shinichi feels compelled to fight other Parasytes, who devour humans as food, while enlisting Migi’s help. (Source: Wikipedia, edited)
In 2010 a manned probe sent from the Earth to investigate Mars explodes in the Earth atmosphere and fragments which contain a DNA sample of what is thought to be a trace to possible Mars inhabitants falls on Japan.
That causes mutations all over Japan. People who are infected by the “virus” are called the Iseki-jin (relic persons). The AAST is founded, obtaining the cooperation of structure Doctor Hiroshi Hyuga they develop a suit, “Mars,” as a trump card against the Iseki-jin.
The carrier of the suit obtains super powers, but only a few people, who are DNA compatible with the suit, are able to wear it. Takeru, the son of the doctor, was the first person able to wear it.
While the fragment which fell on Earth is being transported to a laboratory in the USA to be analyzed the transport gets attacked by the Iseki-jin and now Takeru has to fight and defend it for a final solution in this incident. (Source: AniDB, edited)
After moving into the quiet town of Hinamizawa, Maebara Keiichi spends his days blissfully in school often playing games with his local friends. However, appearances can be deceiving. One fateful day, Keiichi stumbles upon news of a murder that had occurred in Hinamizawa. From this point on, horrific events unfold in front of Keiichi, as he soon learns his close friends may not be all that they seem. Based on the amateur mystery game by 07th Expansion, the story is told in a series of different scenarios.
Centuries ago, mankind was slaughtered to near extinction by monstrous humanoid creatures called titans, forcing humans to hide in fear behind enormous concentric walls. What makes these giants truly terrifying is that their taste for human flesh is not born out of hunger but what appears to be out of pleasure. To ensure their survival, the remnants of humanity began living within defensive barriers, resulting in one hundred years without a single titan encounter. However, that fragile calm is soon shattered when a colossal titan manages to breach the supposedly impregnable outer wall, reigniting the fight for survival against the man-eating abominations.
After witnessing a horrific personal loss at the hands of the invading creatures, Eren Yeager dedicates his life to their eradication by enlisting into the Survey Corps, an elite military unit that combats the merciless humanoids outside the protection of the walls. Based on Hajime Isayama’s award-winning manga, Shingeki no Kyojin follows Eren, along with his adopted sister Mikasa Ackerman and his childhood friend Armin Arlert, as they join the brutal war against the titans and race to discover a way of defeating them before the last walls are breached. [Written by MAL Rewrite]
In the distant future, a mysterious floating object appears suddenly in the center of the city. The top secret mission unit “Alta Mira Agency” or AA is commissioned by the Defense Agency to deal with this mysterious invader. In charge of the robot training is Hunagai Otsuya. He must choose one of the girls to receive special training which she will receive in secret. They must use the “Battle Soles” to push back the enemy even at the cost of their lives. (Source: ANN)
References: MyAnimeList, Wiki, ANN