YMMV / Pupa

• Big-Lipped Alligator Moment: The final episode of the anime is full of these, as well as the last Story Arc of the manga.
• Bile Fascination: One of the main reasons viewers watched the anime adaptation. Many go check it out after hearing how it's "one of the ugliest anime ever made".
• Complete Monster: Genjurou Imari is the posthumous grandfather of Maria "Ai" Imari. Founding the Imari Ishin Facility alongside Bizen Chiharu, Genjurou believed that suffering was the truest art form. Adopting orphans and taking them back to his island, Genjurou would torture them by whipping them severely, making them muses to serve as inspirations for his paintings. Genjurou adopts Shiro Onijima and subjects him to years of horrific torture, as well as psychologically warping his mind into accepting the abuse as "loving". While he may not have shared his granddaughter's aspirations, Genjurou is a depraved pedophile who entertains himself with torturing his victims to his heart's content.
• Ho Yay:
  • Yuu gets really touchy-feely with Utsutsu and gives him barely any personal space. That might be more because of Yuu's lack of common sense. Also, basically Yuu is like a male Yume, naive about the world and Adorkable in general. Of course, Utsutsu being Utsutsu, finds Yuu's quirks annoying and disgusting, but finds Yume's adorable.
  • Shiro's partners in work, Haruka and Ryuichi, not only know about Shiro's sadistic tendencies, they love him for it!
• Iron Woobie:
  • Utsutsu has an estranged family, his sister is turned into a flesh-eating moster that can only satisfy on his flesh, he is slowly going insane, and is attacked by supernatural forces who would love to dissect him and his sister many times during the series yet still keeps trying to save his sister. And it turns out that most of what he believed about his family were lies and actually his real family problems were caused indirectly by Yume.
  • Yuu. He was separated from his mate by human scientists. Yuu kept waiting for her until he found out that his mate is incarnated as Yume Hasegawa and has forgotten about him. When they finally met, she rejects him, choosing Utsutsu over him. After angsting for a while, he pulls a I Want My Beloved to Be Happy. And then, she dissintegrates into butterflies with Utsutsu.
• It Was His Sled: Yume was a monster all along.
• Jerkass Woobie: Shiro in spades, once his backstory is revealed. He was an orphan whose mother abandoned him in a public toilet after giving birth to him. He was then adopted by Mad Artist, who was fond of stripping him naked and whipping him to get inspiration for his paintings. Said artist convinced Shiro that violence was the purest form of love. After his captor died, Shiro had difficulties living a normal life, and chose to work for an organization, where he could put his newfound sadism into use. Then, he got his friend Sachiko pregnant and married her, but he had to leave for five years due to work. After his return, Sachiko had conceived a second child (Yume), causing him to think that she had cheated on him. He became abusive towards Sachiko and his son Utsutsu, though it's implied that Genjurou's abuse warped his view of affection. Then, his wife Sachiko is driven mad due to Yume. So he takes his frustrations on Utsutsu. When he finds out that Yume is an Eldritch Abomination, he tries to warn Utsutsu and beats him again. Then Utsutsu is revealed to be a monster (infected by Yume as a child) and dissolves into butterflies. Sucks being him.
• Narm: The ending should be a complete Tear Jerker, what with Utsutsu and Yume dissolving into red butterflies, and the only thing that remained of them was their hairpins... As their voices resounded in the far-off distance... "YUME.... ONII-CHAN.... YUME.... ONII-CHAN."
• Signature Scene: Episode 6 of the anime adaptation, a four-minute sequence where Yume cannibalizes Usutsu alive in a manner reminiscent of a sex scene, was rapidly spread around online after it aired. As a result, it became the most widely-remembered moment from the series, with many viewers and laypeople using it as a byword for stereotypes of anime as both ultraviolent and hypersexual.
• Squick: Cannibalism, ya think?
  • In chapter 15, Yuu sends his memories to Utsutsu's brain by sticking his tongue into Utsutsu's ear.
• Too Bleak, Stopped Caring: The very fact that Yume was an Eldritch Abomination all along, instead of being infected (as viewers first thought) caused many viewers to be turned off by the series. It also doesn't help to note that a lot of the human and monster characters (except for Yuu) have very unlikable personalities that makes the audience hard to relate with (especially Yume, Utsutsu, Maria and Shiro).
• Unintentionally Unsympathetic:
  • Shiro. While his childhood was understandably horrible, it all kind of rings hollow due to the fact that he himself horribly abused his wife and children. We're supposed to feel pity because he can't help but hurt the ones he loves due to his adoptive guardian teaching him that "violence is the purest form of affection", but that's something really hard to sympathize with, especially as he doesn't seem to do much to fix it. However, The Reveal makes things a lot more complicated.
  • Utsutsu is supposed to be a lonely boy who clings to Yume as his emotional crutch due to all the abuse in his life, but he comes off as an angsty kid who refuses to see his sister is an Eldritch Abomination and insists she's innocent. However, The Reveal that the revival spell on him essentially Mind Raped him to be completely loyal to Yume no matter what does earn him a lot of sympathy points.

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