I Leveled up from Being a Parasite, But I May Have Grown Too Much


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Caught up in a ritual performed by a God in another world, Eiji Choukai is transported to another world. The otherworldy God responsible for the ritual looked at Eiji’s potential incarnations and pulled out Classes like those from “I reincarnated into a vending machine.” Only, whereas there are normally several tens of Classes available for a person, the only Class available for Eiji was “Parasite”.

Having no choice but that set-in-stone Class, Eiji reincarnates into his new world despondent. However, after using his powers he suddenly realized its potential. Using the parasite’s powers, he finds he can amplify himself countless times by obtaining other people’s powers. It could be that Eiji’s level might rise too much.

I Leveled up from Being a Parasite, But I May Have Grown Too Much average rating 3.8/5 - 259 user ratings
Associated Names
One entry per line
I Leveled Up Through Parasitism But I Might've Gone Too Far
Kisei shite Level-ageta n da ga, Sodachisugita kamo Shirenai
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12 Reviews sorted by

agreg rated it
August 11, 2016
Status: c10
The synopsis is kinda misleading, so I'll try to give my own description.

MC is an adult NEET (think Mushoku Tensei original MC in his 20s), living off his family's money; even he sees himself as a parasite of a man. Just as he was contemplating this, he finds himself in a place he'd never seen before; a person (who claimed to be a goddess) explained that he's in another world and she can't get him back. As a way to make it up to him, she offers to give him... more>> an easy life by "pulling out" his hidden talents (think "classes" in RPGs). Of course, not ALL of them (the usual number is around 30), but three classes of his choice would be plenty (multiclassing in this world is quite rewarding for adventurers).

To their (unpleasant) surprise, the list of choices available to him contained only one item. And even the goddess herself had no idea what kind of class this "Parasite" thing could be... But what kind of a man would give up with just that, right?

As you might guess from the name, his class allows to get experience (hard-earned by other adventurers) while doing nothing himself ("[...] fruits of my effort of staying for many days in the inn [...]") ; moreover, leveling in this class increases both gain rate and number of "hosts" he can use at the same time. Most importantly, he early on obtains an ability to level in classes of his "hosts" (don't ask how it works). By the beginning of chapter 8 he has 5 "acquired" classes with total level 22 (his original class is at level 17)... And that's when the actual plot kicks off. (Chapter 7 ends with the following line: "It’s likely this was the time when everything started.")

Judging by the name of the novel, this "actual plot" is probably about him wanting to keep lazing about but being forced into heroics because of being the most capable adventurer around.

The story so far is not bad... I can't say for sure, as there are only 10 chapters translated (and they are not that long), but it quite possibly might end up being a fun read. For now, I'll give it a 4 (4.2, 4.4 maybe?).

... Also, the frequency of translation releases has been rather nice so far. It probably won't hold for long, but translator promised there'll be at least 3 chapters per week (4 if he has free time, or even more for donations), which is not that different from the author's frequency. <<less
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scribbledoutname rated it
September 30, 2016
Status: --
3 stars. I would've given this 5 stars if it developed a real plot after the intro chapters.

The premise is great but with like most JP reincarnation series the story is slowly losing momentum because the author clearly hasn't planned where to take it. The MC's just roaming around doing whatever. I may be overreacting due to my dislike of the JP faux slice-of-life trend, but I can safely say that this series -- despite having an awesome idea and good beginning -- is tripping a lot of red flags.

-... more>> No clear long-term goal for the MC
- No real antagonistic force to add tension to the story
- No real character depth or mystery, etc.
- Very vague world (though let me be fair and say it's not a boring world)

There are a few more but yeah. I'd say it's worth reading but brace yourself. Unless the author introduces a lot of new characters and creates some kind of conflict/objective this series is just going to turn into your typical boring faux adventure/slice-of-life story (which fails at being either because the characters aren't deep enough and the plot has zero narrative tension). <<less
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OfficePony rated it
August 16, 2016
Status: c26
Grammar: 2/5 (formerly 2.3/5)
Story: 3/5
Writing: 2.5/5 (formerly 3.2/5)

(Update as of Chapter 26: The author gave us one chapter of "Excitement" then returned to his usual trash filler. The grammar is holding its position at barely tolerable. The writing... ugh. Still, that one chapter gave me a little hope, I'll keep reading. Maybe, just maybe, the writer will pick the story up in the future. B-T-Dubs, Conversations are so basic that it's almost impossible to tell anyone apart just from dialogue, if there were no indicators... more>> you wouldn't be able to tell anyone apart. Every character pretty much speaks exactly the same with no variation except for the curio collector.)

(Update as of Chapter 21: Just about to give up on this series, I'll try out one more chapter, but thus far it's been nothing but disappointment and very short and meaningless chapters. I didn't think the translation quality would differ much, but it's slowly getting worse. Aside from that, you can feel a lack of effort from the author, skipping details by using etcetera to replace descriptions. Honestly, this series had me hoping for something at least slightly better than what is being dished out.)

Honestly, the grammar is just barely passable for my personal tastes, the story is sub-par thus far, but I'm hopeful that they can do something with this. They have an OP-Protagonist with a limiter of knowledge/power vs experience. It's set in a fairly solid first person view point, and though I dislike first person novels, at least it doesn't jump between first and third person perspective as you could find in many other novels.

I'm finding the short chapters and intermittent awkward wording or phrasing to be a slight, but tolerable blemish since it is the work of a translation group (can't judge too harshly since translations can never be 100% correct, and amateur translation groups are doing this for sh*ts-and-giggles).

All in all, I want to know where this story goes, if it can go anywhere. I want to know if the author is going to bother with any character development, or is he just going to write a trashy novel about a guy who always gets what he wants as some kind of compensation for real life inadequacies. I'm hopeful, but also fairly pessimistic about this series... <<less
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SeventhTale rated it
June 14, 2017
Status: c29
Like what other reviews said, this one is pretty generic. There's a plot but it's a bit boring, there's no events that will gave you impression (except from the goddess, for me). The characters are somehow 2d, they don't have depth and it's just like they are made with a specific role and personality just to make the MC's story interesting. I also hate the MC. He's lazy and only gets fired up when he can do something easy, like when he killed the monster easily or like when he... more>> discovered his skills. It is not really recommended to read as possible.

Rating 2.5/5 <<less
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sleed rated it
June 12, 2017
Status: c54
Another Japanese Novel About finding and getting automatic security

No real enemy's here, no real conflict neither. MC thinks : how would I questions the predefined path presented by our hopeless authorities?!- they only need a lil bit of my underserved good luck to really get things going.

Among cartoony enemy's, narrating how he diligently raises a duty full and compliant life and some emulation of adventures MC shows us how to be a good medieval citizen. That's this novel. Except that without its powers all would be meaning less.

MC. Follows the... more>> orders of the meak initially by rational deduction but latter by default, and his powers only serve him to allow for completing the impossible and contradictory path that he is accustomed to follow, his philosophical premises are the same he carried from his last life opportunity. Resembling a 200 kilos obese man telling himself "if only I would be more skinny I wouldn't be fat".

This novel is just general lazssynes and some kind of passive surrender of his goals as his ambition gets disolved by solving a the problems of the daily life of medieval folks.

No philosophical values at stake here (what ambitious bastard would dare to take a risk in this so complicated medieval world), no danger. Just the reassurance that a good guy is doing what's best for the public interest, always measuring and checking on the back of his mind that he doesn't step by any shape or form on other people's toes.
This is not about adventure or pursuing some kind of ambition

The values he seeks is conformity to this medieval environment were his adversaries are safe to be labeled primitive and stupid

And whenever​ a something resembling a challenge appears it feels it's just for taking some kind of struggle, for the same dimensions as one might find that it was an error drinking soda and milk after a meal.

If there was something exciting it was just before MC obtained his automatic guarante of safety, and actually tried to get some kind of traction.

Lately the novel puts bigger emphasis on the daily life of a medieval folk were using magic and having tremendous powers is rationalized not to be used to seek some kind of truth or adventure.

From where he got to level 33 onwards it was automatically assumed that he would be just a nice guy and only problems would come to a good folk (this is the way plot progresses ; by bland accident).

The plot happens to him, he doesn't seeks to move. That's it's the focus; ordinary life, the obtention of automatic safety and a silent celebration, a byproduct of lack of heroic character.

If he didn't have the powers he had he would be in the same miserable position as he was in his last life or the other world.

His powers are just there to reassure him ; don't to anything, keep being a lazy shmug and you could be rewarded by the incompetent gods who are going to give you power to be the strongest in the planet so you can live your tiny life big time. <<less
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GregLuck rated it
January 12, 2017
Status: c41
The premises is promising but it fails to deliver a good flow of story, it feels like a forced my-pace-story. Although leveling is good, the chapters getting boring each time to level up

But it is a good read for casual read
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icarusburnt rated it
August 10, 2016
Status: c9
Still the beginning, but definitely something interesting, a bit of a different story from the norm. While it's a standard reincarnation trope, the way he gets his cheat is unique.


the MC has the ability to leech xp among other things from gullible adventurers, while lazing about in the mean time


Waiting for more chapters to give better verdict
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L0ngDong rated it
August 10, 2016
Status: v1c9
This has great potential and is funny because the MC is doing exactly what I would in his situation. Keep up the awesomeness!
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SageRozenburg rated it
August 9, 2016
Status: c7
Good premise and We have a lazy MC, the world he transfer to is very peaceful, no slaves, no nobles, and no conflicts yet.
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captain crunch
captain crunch rated it
July 24, 2017
Status: c61
Rating: 3.5 stars Translation: 3.5

(My reviews may sound negative, but my format often lists reasons why I didn't give 5 stars.)

[[5 star = almost all readers may enjoy. 4 star = large majority of readers may enjoy. 3 star = 50/50 of readers may enjoy. 2 star = a niche audience may enjoy. 1 star = maybe portion of niche audience may enjoy.]]

[[5/5 = Infrequent minor errors. 4/5 = Frequent minor errors or infrequent major errors, no difficulty to read. 3/5 = Frequent major errors, some difficulty to... more>> read. 2/5 = Difficult to read. 1/5 = Unreadable.]]

NEET in his early 20's gets sent to a medieval fantasy RPG world by that world's goddess (reason a little unclear). Transferred people usually get to pick an attribute class (mage, fighter, etc), but the only class MC can pick is "Parasite." It turns out to be a cheat ability that allows him to level up and get money without leaving his room. Story is still a bit early, but MC mostly levels up in a lazy way as a lazy adventurer, but slowly becomes more involved with other characters and events around him.

Features: Lazy MC, cheat ability, fast leveling, fantasy RPG world, RPG combat/magic/job system, RPG monsters, goddess, adventurers, dungeons, individual and small party combat. SO FAR no demihumans, barely a hint of romance/harem, no world/nation building, no technology gap, no political or factional conflicts.

I've read too many LN/WN of this genre. They are all fairly similar to me, now. This story is pretty much standard, except the cheat ability is a little different than others that I've read. If you are a fan of this genre and these features, you will probably like this story. If you're not a strong fan, then it'll probably be 50/50 whether you like it.

Specific positives: MC does progress a little from being a NEET. Slowly does more difficult adventuring requests, meets more people, plays bigger roles. Story itself isn't bad.

Negatives: Story maybe too slow for some readers. MC has no big goals or challenges, just being a lazy adventurer. Some readers hate cheat abilities. The scope of the story's setting is pretty small, so far just 1 dungeon and 2 towns.

I feel like this story is still in the beginning phase, so maybe more stuff will continue to develop. However, if nothing really starts happening soon, some readers may get bored. Translation is OK, but sometimes feels like chapters are unedited. No loss of meaning, but some chapters can be difficult to read. <<less
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Fuxy rated it
December 6, 2016
Status: c41
Slightly slow paced bit nevertheless an interesting take on the being transported to new world genre.

The fact that the MC is only interested in fulfilling his selfish needs without a clear goal is quite a realistic take to it.

I also found the friendy enviorment and townspeole as quite a refreshing take on it too however a few negative characters would have helped with the realism a little bit.
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AnonyMouse0007 rated it
September 22, 2016
Status: c31
Plot is decent. The MC is not a slime or virus etc. He is a shut in, because his parents let him get away with it.


He died and of course reincarnated. The goddess gave him a unique job because of his shut in status. Then we get to watch what he does with it. Btw, he is starting to work and get involved, so its not one of those sleep all the time stories.

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