No anidb entry, to world-art entry, no ANN entry...
Still I know there are 3 OVAs, made in 1990-1991, VHS & LD releases exist (Columbia Video).
A bunch of live action exists too. This seems to be a Yakuza-type story.
The three VHS covers are there:
http://page4.auctions.yahoo.co.jp/jp/auction/d89777889
I love these challenges. It's always reinvigorating to find unknown Japanese animations, no matter their release date.
Title:
Otokogi (男樹) [Furigana: おとこぎ]
Studio: Columbia
Original work: Hiroshi Motomiya (本宮ひろ志)
1990-04-14; Otokoki, 50 mins., Columbia, HC-500
http://www.allcinema.net/prog/show_c.php?num_c=151056 http://www.allmedia.jp/web/shop/detail.php?code=Cn-an-a5-HC-500
1990-09-01; Otokoki 2: Yabou Hen (男樹2 野望編), 56 mins., Columbia, HC-596
http://www.allcinema.net/prog/show_c.php?num_c=235647 http://www.allmedia.jp/web/shop/detail.php?code=Cn-an-a5-HC-596
1991-04-01; Otokoki 3: Kanketsu Hen (男樹3 完結編), 53 mins., Columbia, HC-784
http://www.allcinema.net/prog/show_c.php?num_c=235648 http://www.allmedia.jp/web/shop/detail.php?code=Cn-an-a5-HC-784
And there is a little info about it in anime NFO.
http://www.animenfo.com/animetitle,2856,ebwcrk,otokogi.html
And on top of that, this OVA has a sequel:
Title:
Shin Otokogi (新・男樹)
Distributor: King Records
Original work: Hiroshi Motomiya (本宮ひろ志)
1998-05-16; Shin Otokogi 1: Boushuu Muratakumi Tanjou! (新・男樹 第1巻 房州村田組 誕生!)
1998-09-04; Shin Otokogi 2: Sensen Fukoku! (新・男樹 第2巻 宣戦布告!)
And also some info about it (this time animeNFO is confusing some info with the live-action versions).
http://www.animenfo.com/animetitle,3234,aqbzvt,shin_otokogi.html
http://30th.pierrot.jp/staticpages/index.php?page=ova_list
http://www.tfc-rights.com/animated/animated_04.html
Just because it's not in ANN, doesn't mean there is no info in English about an anime. I am not a big fan of ANN for this, as it normally is misleading. Other DB normally have a more broader range of anime and more correct information than ANN. But in this case, even allcinema and AnimeNFO are wrong with the info about
Shin Otokogi. Just check Studio Pierrot web page to find the correct information.