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This blog about Free Download full Openings / Opening [op] and Endings / Ending [Ed] anime この中に1人、妹がいる!/ NakaImo, One of Them is My Younger Sister!, Who is you don’t have to register or pay to download. It’s easy and free.But if you find several link don`t work or the file was deleted, tell me please and back here about one week later, you will get that songs could be to download. Before you download, make sure right click on link download, then choose "Open Link in New Tab". Contact me if you are going to request the other version from opening or ending this anime. Example: karaoke version, instrumental version, TV size version, Character single, main theme, or Soundtrack music of this anime. I take seriously with all your comment and request. Free download music/songs(mp3) ost.Anime _-_ Don't forget to come back here again.

The story is a bit original, because this guy have to marry a girl who can accidentally be his younger sister. And lucky the protagonist isn't an mediocre idiot, but still not a Don Juan.The art is good so far as i saw, good quality. Nothing to say about the music, not bad. You must watch if you like romance, and harem. it's quite enjoyable if you look for an "ecchi comedy romance".
{Last Updated: Mar 29, 2013}

Opening Theme
"Choose me Darling" by StylipS [TV Size] [Full Ver.] [Single]

Ending Theme
"Heavenly Lover" by All Seiyuu [Download] [Single]

Chara Song:
Vol.1 Konoe Tsuruma [Download]
Vol.2 Miyabi Kannagi [Download]
Vol.3 Mei Sagara [Download]
Vol.4 Rinka Kunitachi [Download]
Vol.5 Mana Tendo [Download]
Vol.6 Yuzurina Housho [Download]
Special Chara Song [Download]

Bonus CD:
CD 1 [Download]
CD 2 [Download]
CD 3 [Download]
CD 4 [Download]
CD 5 [Download]
CD 6 [Download]
OVA [Download]

Kono Naka ni Hitori, Imouto ga Iru! Original Soundtrack [Download]
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  1. Does anyone know when the OP and ED single for this anime comes out?

    1. Release date for,
      OP: August 22nd, 2012
      ED: July 25th, 2012

  2. Please upload the full version of the opening theme from the anime series "Ko no naka ni Hitori, Imouto ga Iru" entitled "Choose me, Darling" by StylipS on the mp3 file. Thanks.

    1. わかった、ワカッタ

  3. a lot of the links for the character songs cant be accessed as well as some of the bonus cd stuff

    1. I cant upload all of them currently, so tell me which one you want ((The Most Wanted)) I will reupload it. It's really difficult to upload it at the same time.

  4. Muchas gracias los mp3 son los que estan vivos.


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