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

Groups Scanlating

Latest Release(s)
v.2 c.2.2 by Imoutolicious LNT (230d ago)
v.2 c.2.1 by Imoutolicious LNT (337d ago)
v.2 c.1.3 by Imoutolicious LNT (386d ago)
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Status in Country of Origin
4 Volumes (Complete)

Completely Scanlated?

Anime Start/End Chapter

User Reviews


User Rating
Average: 8.7 / 10.0 (47 votes)
Bayesian Average: 7.94 / 10.0
 55% (26 votes)
 15% (7 votes)
 17% (8 votes)
 2% (1 votes)
 0% (0 votes)
 2% (1 votes)
 2% (1 votes)
 2% (1 votes)
 0% (0 votes)
 4% (2 votes)

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

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KIM Wolhui [Add]



Original Publisher

Serialized In (magazine)

Licensed (in English)

English Publisher

Activity Stats (vs. other series)
Weekly Pos #782 increased(+280)
Monthly Pos #1687 increased(+78)
3 Month Pos #2332 increased(+94)
6 Month Pos #2761 decreased(-312)

List Stats
On 405 reading lists
On 262 wish lists
On 12 completed lists
On 5 unfinished lists
On 141 custom lists

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User Comments [ Order by usefulness ]

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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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