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Trepanation is the procedure of drilling a hole in the skull. It is said to increase the blood circulation and improve pressure inside the skull. It is also said to bring out a person's sixth sense, the ability to use ESP, see ghosts, move objects with one's mind. This is speculative fiction based on the concept of trepanation.


Related Series
Eye of Homunculus (Spin-Off)

Associated Names

Groups Scanlating

Latest Release(s)
v.14-15 (end) by Illuminati-Manga over 12 years ago
v.13 by Illuminati-Manga over 12 years ago
v.12 by Illuminati-Manga over 12 years ago
Search for all releases of this series

in Country of Origin
15 Volumes (Complete)
10 Volumes (Bunkoban, Complete)

Completely Scanlated?

Anime Start/End Chapter

User Reviews

2 topics, 14 posts
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User Rating
Average: 8.3 / 10.0 (1007 votes)
Bayesian Average: 8.24 / 10.0

Last Updated
December 24th 2023, 5:02pm



Category Recommendations





Original Publisher
Shogakukan (2003, 2015)

Serialized In (magazine)
Big Comic Spirits (Shogakukan)

Licensed (in English)

English Publisher
Seven Seas (3 Omnibus Volumes - Ongoing)

Activity Stats (vs. other series)
Weekly Pos #551 increased(+32)
Monthly Pos #1050 increased(+147)
3 Month Pos #1493 increased(+226)
6 Month Pos #1862 increased(+148)
Year Pos #2025 increased(+209)

List Stats
On 1502 reading lists
On 1572 wish lists
On 1744 completed lists
On 104 unfinished lists
On 486 custom lists

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over 13 years ago
over 14 years ago

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User Comments  [ Order by usefulness ]
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by Macabreriz
September 26th, 2023, 12:06pm
Rating: N/A
The ending feel like a different genre from the whole manga, also the psychology aspect in this manga is all over the place. The author is trying to make it meaningful.. even though some are gross and miss but like i still enjoy reading it. The gender chapter is pretty good imho.
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very strong start brought down by weak ending  
by WorldendDesignator
November 15th, 2022, 3:01pm
Rating: 6.0  / 10.0
Sadly, this manga is plagued with a lot of armchair psychology and a disappointing, rushed final stretch that does some real disservice to the MC's character study overall. However, looking past all that, it also features an extremely original premise, a particularly great art style and at least the first half of it is more than solid and WILL keep you on the edge of your seat.

... Last updated on November 15th, 2022, 3:02pm
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Great ending (a bit sudden though)  
by Joese
June 29th, 2022, 10:12am
Rating: 8.5  / 10.0
It's starts fine, way more outlandish than the ending. I personally was about to drop it after the sand girl, since it's a bit heavy and the later meta conversations of vol11 bored me a bit, but I'm glad I didn't. After vol 11 the story goes back on track and ties everything down.

My complaint would be that the MC and the sand girl have a grotesque habit.

... Last updated on June 29th, 2022, 10:16am
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by sloez
January 29th, 2021, 6:41am
Rating: N/A
idk it was kinda ehhh...
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Weird but absolutely great  
by Noburo
July 22nd, 2017, 9:55am
Rating: 9.5  / 10.0
This is one of the few series, if not the only, that I don't know what I feel about how to feel about. The ending was the most I say that in a good way. But this manga, in simple terms, is very odd. It very much earns the psychological/mature genre tags. Be warned, the ending is,,, interestingly bittersweet, if you will.
If you wind up reading this, also be warned that you will fill like you're on an acid trip. It can get weird, very weird. Even weirder when taken out of context. This manga also deals with highly relevant issues such as transgenderism, depression, and more.
Its a very good read that really deserves more love, so I highly recommend giving it a shot.
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Amazing, but real mess  
by Fhighlander
August 21st, 2015, 8:53am
Rating: 9.0  / 10.0
After reading Koroshiya Ichi, I thought this mangaka couldn't dig deeper in the psychological gender. Fortunately, I've been wrong...

As someone said, this manga is a road to self enlightenment. Sometimes you want to be important to someone but you give enough credit to yourself. Everytime the MC sees another Homunculus he starts to realize his own inner demons.

Spoiler (mouse over to view)
The ending wasn't all bad, but I hoped would be somehow light hearted since the MC had some huge mental issues and he had suffered a lot. When Nanako died because of him I thought he would kill himself but apparently he just resumed his quest to find someone who would see his heart.

Anyway, it's a really alluring manga, but the ending left a bitter taste to me.
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by Serendipity_
August 10th, 2015, 3:32pm
Rating: 8.0  / 10.0
Wow...this manga sure was messed up, in a good way. The story was original, but like many others here I didn't get the meaning? I mean, what WAS the meaning of this manga? Was it that all humans are liars and assholes? That you should be true to yourself? That you shouldn't do plastic-operation because you will end up homeless? Every time I thought I had it figured out, I got mindfu*ked and had to rethink my impression of the story all over again.

Honestly though, I didn't like the main character. He was a whiny egoistic asshole. Enough said.

I liked the Ending, it was fitting. So a +1 point for that.

... Last updated on August 19th, 2015, 2:21pm
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It was great up until the end.  
by weltall2
July 13th, 2015, 4:30pm
Rating: N/A
I love mangas and I feel that they are better than anime in many ways, but it is easier to watch rather than read, obviously. I would say that the atmosphere in anime is better, but manga many times draw me in. Now why I said that.. it has been a really long time since a manga made me read nonstop from beginning to the end. It is so rare to find manga's and I started reading after a guy suggested it. But I literally started reading it today (Well kind of yesterday since it is 2am now that I am posting, but you know what I mean) and finished it. I am not sure how I could describe it... truthfully with this manga 1 picture can result with 1000 words. I highly suggest it to everyone, at least up to the point he starts seeing things.

A lot of scenes and moments are disturbing, so if you are a closed mind person I suggest to skip it. It would make you feel unpleasant a lot of times.

I do want to though point out something about the ending that will be a spoiler for anyone that will see it so... if you do not want to see it, don't. I just want to express about not expecting this.
Spoiler (mouse over to view)
I expected a better ending and I am not talking particularly about a happy ending. Actually with such a story I did not expect a happy ending at all. In the end he ends losing his mind after he finds his supposedly real self. The end was nice to be honest but felt quite unrewarding. Like you read a story of a man struggling to achieve something and as soon as he gets 1 step away from realizing his goal, he dies. (PS: The guy does not die).

It is a shame the ending felt so unrewarding (to me), but then again it was ok and an acceptable ending. I would by no means call this a bad ending.The ending though is the only reason it does not get a 10/10 since the ending of a story to me holds 70-80% of how much I will end up liking the story. But again, it is personal preference that makes me not like it.

I am really glad I found about this manga and read it!
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Flat and meaningless  
by cherrykookie
June 17th, 2015, 12:58am
Rating: 7.0  / 10.0
This manga definitely was an interesting first at least. It intrigued me from the start, had me reading on and had some great concepts.

Unfortunately, starting from the Nanako arc, it went downhill. The ending was rushed and fell flat. It failed to be meaningful from my perspective. The author throws a bunch of twisted "wtf" moments and overplays it in an attempt to be meaningful. Can fool those who are newer to this genre, but (sadly) it couldn't fool me.
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What did you learn?  
by fovika
May 23rd, 2015, 5:53pm
Rating: 9.9  / 10.0
Well now, that was an unexpected journey. I feel as though everyone should read this, no exceptions. It makes you think (as any psychological tagged story should). You get involved and you can't change the fact that this is one story that sticks to you.

The ending is not what I wanted, but not unwelcomed. The whole flow of the story is not really what I wanted, but not unwelcomed, if that makes any sense. Everything that happens is calculated and controlled by the mangaka. A very well made manga.
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