Kiseijuu: Sei no Kakuritsu

All of a sudden, they arrived: parasitic aliens that descended upon Earth and quickly infiltrated humanity by burrowing into the brains of vulnerable targets. These insatiable beings acquire full control of their host and are able to morph into a variety of forms in order to feed on unsuspecting prey.

Sixteen-year-old high school student Shinichi Izumi falls victim to one of these parasites, but it fails to take over his brain, ending up in his right hand instead. Unable to relocate, the parasite, now named Migi, has no choice but to rely on Shinichi in order to stay alive. Thus, the pair is forced into an uneasy coexistence and must defend themselves from hostile parasites that hope to eradicate this new threat to their species.

[Written by MAL Rewrite]

Izumi, Shinichi Main

Shimazaki, Nobunaga Japanese

Migi Main

Hirano, Aya Japanese

Tamiya, Ryouko Supporting

Tanaka, Atsuko Japanese

Kimishima, Kana Supporting

Sawashiro, Miyuki Japanese

Murano, Satomi Supporting

Hanazawa, Kana Japanese

Joe Supporting

Murase, Ayumu Japanese

Gotou Supporting

Inoue, Kazuhiko Japanese

Uragami Supporting

Yoshino, Hiroyuki Japanese

Uda, Mamoru Supporting

Suzuki, Takuma Japanese

Hirokawa, Takeshi Supporting

Mizushima, Yuu Japanese

Nakatani, Toshio Producer

Shioiri, Souta Producer

Kirimoto, Atsushi Producer

Ooshima, Yuka Producer

Reviews

Dec 31, 2025

jlzap

Recommended

This was a real good series. We follow an interesting concept, with our main character having his right hand taken over by a parasitic alien. These two work together at times but against each other at other times. The show takes us through their relationship, as well as the relationship between Shinichi and his peers and how that changes now that he has his parasitic alien hand, Migi.

The story is unique, very developed, and has a satisfying ending. The only reason it's not higher is because I feel like they could've done a biiiit more with it to make it perfect. ... It was so close, but not quite there.

An absolute W of a watch though, would highly recommend.

Reviewer’s Rating: 8

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Jun 5, 2025

Shirogari

Mixed Feelings

Kiseijuu or Parasyte is an anime with a title that ironically enough does not unambiguously refer to the parasites that the anime is about. Good luck figuring that one out (episode 21 4:10).

Parasyte has a pretty interesting story about parasitic aliens appearing on the world. The story takes place over a relatively long period of time (more than a year) which gives the situation a lot of time to develop which makes the story way more interesting. It does however lead to a slightly jarring switch in pacing near the end when a lot of events happen in a single day. A problem with the ... story is how it's situated in the rest of the world. In Hollywood movies aliens always invade New York or some other US city, it is then unsurprising that in this Japanese work the main place the story takes place is in the mid-sized Japanese city of Fukuyama. What is surprising however is that in the story the events that take place in Fukuyama have a disproportionally huge effect on the rest of the world while they really shouldn't which detracts from the story a bit. There are quite a few nice philosophical and horror elements in this story.

The characters are quite good. They are well written, have believable personalities and I often enjoyed just watching them interact. The anime does, however, enjoy putting them in situations that are annoying to watch or lead to poor outcomes. Personally I found these situations painful to watch and lamented some of the characters decisions but it's not like this is objectively bad.

The animation not amazing. There were quite a lot of cgi crowds with a crowd sometimes constituting of only 3 people. They're never present for long though and are easily ignored. Overall the animation was adequate for the story and managed to portray the parasites well enough but it's not an animation that you'll watch for the story. The music was pretty good and the main OST was very suitable.

Overall this is a pretty good anime with a nice story and interesting philosophical elements. It has good characters and adequate animation. If the idea of extra-terrestrial parasites infecting and killing people sounds remotely interesting to you then this is probably worth a shot.

Reviewer’s Rating: 7

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Nov 23, 2024

Ouimerci

Not Recommended

Funny

TLDR: overrated and underwhelming anime. It's not terrible per se, it's just extremely uninteresting.

Sadly this anime is very overrated, to a point I don't get why people were hyped at all.
The best description for me is "underwhelming". Nothing is actually interesting past the first 2 episodes. Most fights in the second half involve characters you just met and have not attachment to, whatsoever.

The most tensed episode is the last one... And it's just extra, unnecessary drama that brings nothing new to the story.

The rest is either predictable, unnecessary or underwhelming. When a major death happens, the animation and direction makes it look like a slice ... of life anime.
The fights themselves are the best part, but are still unoriginal.

Reviewer’s Rating: 2

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