[JP] Kono Naka ni Hitori, Imouto ga Iru!

[WTK]

Amazon Japan links: Vol.1 (http://www.amazon.co.jp/dp/B008AEAJAY), Vol.2 (http://www.amazon.co.jp/dp/B008GYPLHE), Vol.3 (http://www.amazon.co.jp/dp/B008GYPLII), Vol.4 (http://www.amazon.co.jp/dp/B008GYPLI8), Vol.5 (http://www.amazon.co.jp/dp/B008GYPLJW), Vol.6 (http://www.amazon.co.jp/dp/B008GYPLTC)

Vol.1 - 7350yen, 9/26

via CD Japan
- Vol.1 (http://www.cdjapan.co.jp/detailview.html?KEY=ZMXZ-8061)
Includes episodes 1 and 2, digital jacket by Cuteg and super picture label.

Special Features: textless OP & ED, audio commentary feat. Konoe Tsuruma (CV: Kaori Ishihara)

First Press Detail: novel (1) newly written by the original author Hajime Taguchi, character song CD (1) & bathroom poster (1) featuring Konoe Tsuruma
(source (http://www.neowing.co.jp/series_list.html?sid=3500))

[Draneor]

It's getting an OVA (http://www.amiami.com/top/detail/detail?gcode=MED-DVD2-17277&page=top).

Personally, I don't think this can end well... But I suppose those that wanted sex in this anime have a chance at being happy.

[WTK]

It's getting an OVA (http://www.amiami.com/top/detail/detail?gcode=MED-DVD2-17277&page=top).
via ANN (http://www.animenewsnetwork.com/news/2012-09-20/nakaimo-my-little-sister-is-among-them-gets-original-video-anime)
Nakaimo - My Little Sister Is Among Them! Gets Original Video Anime

Blu-ray to have 13th episode set after TV anime, July 16 event footage

Japanese production company Media Factory will release a NAKAIMO - My Little Sister Is Among Them! (Kono Naka ni Hitori, Imōto ga Iru!) original video anime on Blu-ray Disc on March 27, 2013. The Blu-ray will contain the unaired episode 13 "Ani, Imōto, Koibito" (Big Brother, Little Sister, Lover) that is set after the television series, as well as footage from the July 16 NAKAIMO - My Little Sister Is Among Them! event as a bonus extra.

The unaired episode will feature all of the heroines from the television series, and the bonus extra will contain the opening and ending theme performances and offstage footage from the July 16 event. CUTEG, the illustrator of Hajime Taguchi's original light novels, is creating a new exclusive illustration for the Blu-ray's jacket.

Source: Amiami (http://www.amiami.jp/top/detail/detail?gcode=MED-DVD2-17277&page=top) via Yaraon! (http://yaraon.blog109.fc2.com/blog-entry-11929.html)
EDIT: Amazon Japan link (http://www.amazon.co.jp/dp/B009EA8B4E) - 7350yen, 3/27

CD Japan (http://www.cdjapan.co.jp/detailview.html?KEY=ZMXZ-8067)
Original animation "OVA no Naka ni Hitori, Imoto ga Iru!," a sequel of "Kono Naka ni Hitori, Imoto ga Iru!," comes on Blu-ray. Directed by Munenori Nawa and animated by Studio Gokumi.

Special Features: event footage ("Kono Event no Naka ni Hitori, Imoto ga Iru!?")

First Press Detail: a bonus CD with medley of intro and ouro themes, bath mini-poster (7) featuring illustration of Ikusu Mizutani

[hpulley4]

I got the OVA. The 23-minute episode is really fun and is episode 13, not just a fanservice OVA episode; the 2 hour 7-minute event is a lot of fun, great interactions between the seiyuu; the mini poster is um, very nice; the 8 song continuously mixed OP, ED and character song CD is great; lovely jacket illustration, digipak, nice package! Great keepsake!

The event has seiyuu answering questions, then they do a reading in front of some manga which is really fun, then they show an episode and do some live commentary and goofyness, then StyLips performs the OP Choose Me Darling and another single Brand New Style, singing very live and dancing, then answers some questions, then the seiyuu perform the ED Heavenly Lover. I love this sort of event footage, it is the sort of extra that really makes me want to import. I'm very pleased with this one! Surprised they saved it for the OVA disc rather than just throwing the episode by itself on a disc in with one of the novels.