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Sekai Ichi no Imouto-sama (Novel)  
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Maria Lunalady Blackhazel is a beautiful genius with heterochromatic eyes. Oh, that and she's also the leader of a ruthless, multinational private military company that brings forth chaos and destruction. Known as the "Princess of Pure Darkness" around the world, she's the subject of many people's admiration, hatred and fear. But to the main character Siyoung, she's an irrelevant person living in a completely different world. That is, until one day she suddenly shows up and kisses him.

"I wanted to see you, Onii-sama..."

And just like that, Siyoung was given the world's greatest little sister.

*Please note that this is a Korean light novel.


Related Series

Associated Names
Sekaimo (Novel)
The World's Greatest Little Sister (Novel)
세계 제일의 여동생님

Groups Scanlating

Latest Release(s)
v.2 c.3.2 by Imoutolicious LNT over 3 years ago
v.2 c.3.1 by Imoutolicious LNT over 3 years ago
v.2 c.2.2 by Imoutolicious LNT over 4 years ago
Search for all releases of this series

Status in Country of Origin
4 Volumes (Complete)

Completely Scanlated?

Anime Start/End Chapter

User Reviews


User Rating
Average: 8 / 10.0 (51 votes)
Bayesian Average: 7.45 / 10.0
 49% (25 votes)
 14% (7 votes)
 16% (8 votes)
 2% (1 votes)
 0% (0 votes)
 2% (1 votes)
 4% (2 votes)
 2% (1 votes)
 0% (0 votes)
 12% (6 votes)

Last Updated
December 22nd 2012, 9:14pm PST



Category Recommendations





Original Publisher

Serialized In (magazine)

Licensed (in English)

English Publisher

Activity Stats (vs. other series)
Weekly Pos #477 increased(+217)
Monthly Pos #1289 increased(+110)
3 Month Pos #2944 increased(+148)
6 Month Pos #4145 increased(+468)
Year Pos #5821 increased(+977)

List Stats
On 433 reading lists
On 284 wish lists
On 14 completed lists
On 8 unfinished lists
On 179 custom lists

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User Comments [ Order by usefulness ]

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Not worth reading!? For you to decide!   
Rating: 1.0 / 10.0
by bakaleaf
March 13th, 2015, 9:38pm
First of all if you read it, it well ruin all your image of little sister.
Sad to say the author might have a huge hatred to brother or sister with brother complex.
As I start reading Volume 1 until I finish reading it all I can say is its horrible beyond reason.
In there world its not incest since its tradition that part is alright but as the story move forward I realize how weak and ugly the characters are.
First is the MC the so called brother which is brutally abuse by his sister everyday. Think of all the humiliation you can think of from their house to their school. its more of torturing your older brother sort of a story.
Second is the Two Female sisters. Maria is a good for nothing sadist who self proclaimed love his older brother but won't take action even if his brother is brutally abuse by the other sister. For her as long as her brother is at her side then its ok even if that brother is a corpse (she mentioned once that a brother must just be a puppet for her) . Next is Lily ( I won't say anything about her except she is maria's twin) Lily is the most horrible of the two forget about tsundare or even yandare nothing of that sort of character. Lily existence is only to torment humiliate torture and insult the MC her older brother.
So like I said forget brother complex this is just brother torture as an older brother this is beyond disgusting.
I won't mention the other character the ugliness in this story is deep.
If you enjoy NTR then please do read this. (Change my mind I'll continue reading hahaha)
its disgusting but hey I'm just human biggrin
Volume 2 now reading

... Last updated on March 13th, 2015, 9:44pm
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Janky as fuck   
Rating: 5.0 / 10.0
by imercenary
April 24th, 2013, 4:29am
The story is great at maintaining the setting. Child soldiers, "damn the war ignorant masses"-mentality and early-story Asia(South Korean)-to-European setting shift are all done well and played straight throughout the story.

The problem is that the characters are all over the place. The main character swings between war/culture shocked civilian to dreaming eroge protagonist. The girls are even worse. One swings from supersoldier child soldier killing machine to shy, perverted-comedy partner. Another is a classic high class tsundere but with endless randomly scenes of over-the-top-violence.
Spoiler (mouse over to view)
(Before the end of chapter 2, the protagonist has gotten so used it that he dodges one of her flying kicks, which results in her falling off a balcony... and into the ocean.)

If you like a "war is hell"-business story, this is not bad considering how rare and sensitive the subject is. Otherwise, stay away.

... Last updated on April 24th, 2013, 4:30am
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Learn to live and accept... well at least until it turns bad   
Rating: 8.0 / 10.0
by dim1
July 13th, 2012, 10:30pm
So far the incest thing hasn't flared its ugly head in this story but who knows. When that happens I'll drop this as quickly as I took it up. Honestly, most of the time the whole Sister/Brother thing, rather touching in one way but completely disgusting in another. This one can be equivalent with cousin/cousin relation since they are half-siblings, but still I get a mild distaste, which would have repelled me but the concept is fairly interesting, you have the world's most powerful person being the MC's little sister, and to top it off she it the princess of darkness, with a private military to boot.
Anyway, the novel makes it clear there won't be any full-blown incest as far as I can tell so take it up if your a fan of ridiculous comedy.
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