Koisuru Kiseichuu

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Alternative Titles

Synonyms: Parasite in Love

Japanese: 恋する寄生虫

Information

Type: Manga

Volumes: 3

Chapters: 16

Status: Finished

Published: Jul 26, 2018 to Dec 26, 2019

Genres: Drama, Romance, Supernatural

Demographic: Shounen

Serialization: Shounen Ace

Authors: Miaki, Sugaru (Story), Hotate, Yuuki (Art)

Statistics

Score: 7.52¹ (scored by 4,024 users)

¹ indicates a weighted score.

Ranked: #2804²

² based on the top manga page. Please note that 'R18+' titles are excluded.

Popularity: #1910

Members: 10,918

Favorites: 255

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7.52

Ranked #2804Popularity #1910Members 10,918

MangaShounen AceMiaki, Sugaru (Story), Hotate, Yuuki (Art)

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Volumes: /3

Chapters: /16

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Synopsis

The story is about a man whose compulsive tendencies make it impossible for him to keep a job, and a young girl who skips school and loves insects. The two meet, come to support each other in reintegrating into society, and fall in love. There's a problem, however: namely, the parasites in their heads.

(Source: vgperson)

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Background

Koisuru Kiseichuu was published in French by Delcourt from February 19, 2020 to June 16, 2021, in German by Egmont Manga from April 1, 2021 to June 2, 2021, and in Italian by Edizioni BD under the J-Pop imprint on April 21, 2021.

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Characters

Sanagi, Hijiri

Main

Kengo, Kosaka

Main

Reviews

Dec 25, 2022

qrimosa

Recommended

This is a very underrated manga for me.

Story - 9
The story abous a grown male and school girl falling in love with each other by the cause of the "worm". Expected a happy ending but in the last chapter we got revealed that the "resistance parasites" were only in Kousaka's body. Surprisingly i wasn't as sad as i expected to be when it's ended, but anyways i liked that plot twist in last chapter rather much.

Art - 9
Amazing art for this genre, coudn't say more.

Character - 10
We are shown the backstory of misanthropy and of the MCs and it's cause, also we get to ...

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Oct 27, 2021

84DaysWithout

Recommended

Part of being human is to encounter a problem that subtracts from our enjoyment of life. Whether this issue is in the form of addiction, illness or phobia, it would surely make sense for us to wish those problems away so that we can evolve into our ideal selves. Right?

This manga poses an interesting thought experiment to this topic - if you got rid of your most problematic behavior flaws, would you not change into a foreign version of yourself? Who is the you that no longer suffers from social anxiety? Do you remember the version of yourself who never feared rejection? "You" may ...

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May 8, 2024

Ken-ji

Mixed Feelings

A manga with a really gripping conceit that unfortunately gets bogged down by a lot of the smaller details that just don't quite add up for me. I ended up feeling less enthusiastic about it as a whole, and more just appreciate certain aspects of it.

I'll start with what I really loved about it. The character art is very Yoshitoshi Abe-esque, which I was really fond of. Honestly from a pure technical level, it might even be better than lots of the stuff he's done and I really hope this artist makes more works in this style. I would happily check out anything they do ... from this point.

The other aspect that really sold me, especially as the story was first revealing it, was the concept of the parasitic, controlled love of the two main characters. The start of this manga feels compelling in some ways, but is not something terribly unique or interesting unless you are super invested in the characters already. The reveal of the parasites re-contextualizes everything that's happened so far and adds much more to it. The existentialist ideas that now lurk in the background of every interaction they've had are pervasive and eerie in a really effective way. Suddenly, the story is taking a very unique approach to the emotional turmoil of these characters.

I was equally impressed with how the reveal played out. I felt that the flashbacks with the professor and his patient slowly uncovering how the parasite behaves was well-handled. Their actions and motivations made sense, and of course, the omnipresence of the parasites in their own minds carried over that level of intrigue I was talking about. The question of what is their true free will and what is being controlled by the parasite is seriously fascinating and it was immersing me into this manga so much by this point.

From here, however, I started to notice more aspects that were really taking away from how I felt the story should have been playing out and was feeling more and more plagued by what seemed like unclear plot decisions. For example, I had expected that this reveal was implying that Izumi knew Kosaka was infected with the parasite, or at least strongly suspected it after seeing his interaction with the cashier. Turns out, Izumi was totally not expecting him to be infected and literally only chose him cause he somehow had dirt on him, since he knew about Kosaka making a virus (which he never explains how he knew by the way). If it had been the way I was assuming at first, I felt that it would make sense. Izumi and Sanagi's grandfather would be trying to further their research on the parasites in a controlled environment by studying exactly how they form connections with other hosts, but instead their motivations turned out to be way more pure, but in turn, way more bizarre. They were actually just trying to have someone become Sanagi's friend so that she'd be more willing to have treatment and try and save herself from the parasite.

Why would anyone think that paying a random, germophobic, 27 year old man to be a 17 year old girl's friend would work out in any way? I mean the question of whether they did connect because of the parasites (and if so to what extent it was and wasn't their own emotions) is meant to be left somewhat open-ended, but regardless it was a miracle that they got paired up. And to pursue this as your plan to get her some friends, let alone WITHOUT the knowledge or even suspicion that Kosaka is a host just seems fucking alien. I'm aware that they tried to pay other people before Kosaka, including some girls her age, but why they would ever turn to this random, grown-ass man who makes viruses and hates germs is just lost on me. I mean, sure, you have dirt on him, but you're paying the people anyways so that doesn't make him any better of a candidate than anyone else. If Sanagi and Kosaka had met at least once on their own, we could say that it was due to the signaling properties of the parasite, and Izumi could have just followed on what seemed like an oddly promising connection they could form (with or without knowledge of Kosaka as a host, he would be valid for trying this). If Izumi knew or suspected Kosaka of being a host, it would make sense for the reasons I named earlier. As it currently stands, there is no comprehensible reason why they would chose Kosaka.

Honestly, even the idea of "pay someone to be her friend" just seems like such a loose, roundabout plan that can go wrong in so many ways, ESPECIALLY considering they believe the real risk of the parasites is them copulating with the ones of another host they've spread to and reaching a number where a human can't stand to live with anymore. If Sanagi was isolated, instead of actively being made to meet new people, her parasites would never have a way to multiply to the point of causing her to un-alive herself (this being based on the knowledge they are working with at this point). So why was this their plan at all?? Couldn't you just start giving her the medication without her realization, instead of trying to "instill in her a will to be cured" since you were so convinced at this point that medication was in fact the cure? They wholistically believed that the suicidal thoughts were cause by the parasites, so I understand the point of saying "someone dealing with these thoughts needs to want the help themselves or it's meaningless" but in their scenario, that wouldn't really play a part in it. They're under the impression that the parasite is causing all those issues in her head. Again, I'm not implying that this would be the actions that would solve the problem, as is revealed in the end, but based on their understanding, their actions would be more along these lines. The plan they did come up with just kinda comes from no logical thread.

Once they do discover that Kosaka is a host, I don't really see why no one was bothering to ask him questions about his experience with the parasite, like when he first started having his germophobic condition. Because Kosaka, as it turns out, has had his parasite since he was 9 YEARS OLD. He's been dealing with it for 18 years and never un-alived himself. I think what the manga is implying with this is that since it's revealed that the parasites eat away at negative emotions, Kosaka's level of anguish was enough for the his amount of parasites to deal with, whereas Sanagi's levels of anguish were enough that she was still feeling depressed and would need more parasites to relieve those feelings. So I don't think it's a flaw that Kosaka has been fine for 18 years (although if there was a flaw there, it would be that this feels like an insane amount of time for him to never have experienced any "signaling"), the flaw is in the fact that neither Izumi nor the grandfather bothered to ask anything about another host subject who could offer them valuable information.

The other aspect that just feels like a huge hole is the research and conclusions done on the parasites themselves. As I said, I was really enjoying the way the first experiments were unfolding. I thought it was realistic for there to be a lot of unknown factors and felt that the studying was well considered. Something that played a large factor in this was that the professor mentions to Izumi's daughter that he has verified that the parasites can be treated with existing medication. This is why he felt comfortable with using his own body to study the parasites and never seemed to treat the test cases with any kind of grave urgency. Taking this at face value, fair enough, it validates the professor's action pretty well. But thinking on this after what happens, the medication had never, in any of the professor's cases so far, completely removed the parasite, it just SEEMED to be working to remove them. The two patients he referred to were never completely treated because they fucked off before he could actually remove the parasite (which he assumed the parasites were making them do to protect themselves).

All of a sudden, the professor doesn't actually have viable proof and kinda seems like total fucking idiot. There are various sicknesses, viruses or diseases that can be treated and improved but are subject to return or worsen given any other factors. Also, the effects or severity of the parasite could very well be more treatable in some people than in others (for instance, the parasites that grew in Kosaka's body ended up creating a variant that was immune to these medical treatments, which really only happens cause there are external factors at play in the parasites formulation which will be different for different people), so why would he take this risk without at the very least seeing anyone make a full recovery? Well the real answer to this is that if anyone had made a full medical recovery from the parasite at this stage in the story, the final reveal would be spoiled, but as far as the logic dictating the actions of the characters this just seems like a major, inexplicable fuck-up.

And speaking of the Kosaka variant parasites, this is probably the outright most egregious plot point for me. I mean, it is definitely contrived that Kosaka HAPPENED to have a variant that is immune to the medication, but as I said earlier the parasite is meant to create new breeds when entering new hosts, so fine, at least there's an explanation for the mini deus ex machina. Way more importantly: why was he losing his symptoms after taking medication? Izumi just describes it as "a lull" and the story leaves it at that. Huh? Can we not unpack that a bit? Is that not just an extremely convenient cop-out? The parasites in Kosaka are immune to medication and yet taking medication relieves him of his symptoms. Why not just keep taking the medication then? Don't you have the best of both worlds, where your parasites will not die off but you can also suppress your germaphobia with the meds? Why is the story implying that his misanthropic symptoms are going to return? Why did they diminish in the first place? Am I seriously meant to just be satisfied with "it was a lul, lol"?

I'm aware that many parts of this story are meant to be allegoric, and while I understand what the conceit is symbolically representing, I also don't think that it's a story where the parasites are not meant to exist in the context of it's world as well. I think the writing is making a clear effort to have the parasites be a realistically explored science fiction concept and for it to follow a set of established rules in the narrative. So although I didn't comment much on the mental illness parallels, it's not because they were lost on me, but because they didn't relate much to my complaints about the characters' actions and established information.

To go back to a big positive and end on a higher note here, I did really enjoy the ending. It made sense to me that the parasites were not the same when transferred to Sanagi because it follows the logic that the parasites are meant to create different variants when entering different hosts. The ambiguous final scene of whether or not she took her own life mirrors the ambiguity that the parasite conceit was adding to all of the character's action in the story. It's a strong final note, even if by this point I was really in my head thinking of all the bits that were pissing me off. Credit where it's deserved, I think this is a great ending.

I honestly wouldn't have felt passionate enough to write about Parasite in Love if not for great decisions that it makes throughout. Honestly at a certain point, I was convinced I was reading something I'd consider a favorite, so when the detractors reared their heads, I was a lot more passionate about them than I otherwise would have been. If anyone feels that I've missed something or interpreted the story differently, I'm totally open to hearing some possible explanations that for these points. I certainly don't think my critiques are definitive, although I made a good effort to dispel my own complaints, because once again, I really wanted to like this more.

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Poll: Koisuru Kiseichuu Chapter 2 Discussion Dumb - Sep 27	0 replies	by Dumb »» Sep 27, 1:13 AM
Poll: Koisuru Kiseichuu Chapter 1 Discussion Dumb - Sep 27	0 replies	by Dumb »» Sep 27, 1:04 AM
Has this manga been fully translated yet? Flutesalad - Jul 9, 2020	13 replies	by INoLuv »» Aug 14, 10:09 AM
Poll: Koisuru Kiseichuu Chapter 16 Discussion waalex11 - Aug 29, 2021	4 replies	by Zevven »» Jan 13, 2023 11:17 PM
Poll: Koisuru Kiseichuu Chapter 9 Discussion FullyCharged - Jan 27, 2021	0 replies	by FullyCharged »» Jan 27, 2021 2:57 AM

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