DeNA’s certainly no newcomer to the party, but they’ve been quietly amassing success in Japan prior to earlier this year. Call it their “Coming Out” party, DeNA’s been on a roll this year, most notably acquiring social and casual games maker ngmoco just a few months prior. It’s also becoming increasingly clear that DeNA isn’t just happy dominating Japan, and marching forward with the U.S., as they’ve now got their sites set on a European acquisition.

As noted by develop-online’s Rob Crossley, DeNA is expected to turn $1.2 billion in revenues from it’s 20 million users this year. Speaking at this year’s LeWeb event in Paris, DeNA CEO Tomoko Namba hinted at the fact that this capital could be used to fund a European acquisition. And what better place to drop said hints than at Europe’s largest tech conference, packed with every audience under the sun from indie developer to major corporation. Namba also did her countrymen proud when she pointed out that the relative strength of the Yen, alongside a slowing growth rate in Japan is placing a number a Japanes firms in a position where Western acquisitions simply make sense. When specifically asked if DeNA had any European acquisitions on their horizon, Namba replied, “Oh Sure.”

Remember, it’s not just ngmoco that DeNA has made headway into the U.S. market with, as they’ve snatched up a few smaller social game developers, including Mountain View, CA based Gameview, and have invested, or rather, become a “strategic partner” in OpenFeint technologies.

However, it’s not all rainbows and unicorns for DeNA, as it seems as though DeNA’s made a few enemies along their assent to the top. It was reported that the Japanese Fair Trade Commission raided DeNA’s offices yesterday, as they investigate allegations that the company had employed unfair competitive practices in relation to their developer’s partners, as well as competition mobile social network operator Gree. What and how the Japanese Fair Trade Commission deems as “unfair” remains to be seen, but an anti-monopoly charge has also been called against DeNA, so before you writing home about the great rise of DeNA, let’s wait and see how this shakes out. Who knows, maybe that money won’t be headed for Europe, but rather to the reparation coffers.

While the game-o-sphere has been alight with rumors of ngmoco’s impending buyout, Japanese social and mobile game leader DeNA officially confirmed the rumors yesterday. This acquisition now makes DeNA the world’s largest mobile social games platform company.

According to the terms of the deal, ngmoco’s shareholders and employees will received $300 million in cash and securities, and have the right to earn additional compensation up to an extra $100 million – all contingent upon performance targets to be reached on or before December 31, 2011. The deal is expected to be finalized by November 9th.

Founded in 2008 by Neil Young, Bob Stevenson, Alan Yu, and Joe Keen, ngmoco games are played more than 50 million minutes a day, with 20 top 10 titles residing on the Apple iOS store. Their plus+ service has been a primary viral driver, and has 13.5 million registered users, with over 50 million friend connections in the network. All of this has arrived under ngmoco’s strong commitment to iOS devices, but the company did announce earlier this year that they’d start developing for Android games and services with an arrival date of Q4 2010, a factor certainly attractive to purchasers DeNA.

“We are delighted to be joining forces with DeNA, a company that we have admired and aspired to,” said Neil Young, founder and CEO, ngmoco. “The opportunity to be a part of creating the number one social mobile game platform company and to benefit from the unique learning and knowledge that DeNA possesses is an amazing way to accelerate our vision for gaming.”

This purchase is a major win for DeNA, whose chief executive Tomoko Namba told the NY Times, “We’re only active in the Japanese market, and we haven’t figured out how to cover the Western market.” With domestic revenues on target to surpass $1 billion in sales in it’s current fiscal quarter, a figure in the range of Facebook, despite only 5 percent of the users, DeNa is a Goliath to be reckoned with – and their now heading for US shores.

From a social/mobile gaming stand point, as a number of rumor mills have astutely pointed out: ngmoco and Zynga share a board member, Kleiner Perkins partner (and former EA exec) Bing Gordon. It goes without saying that one of the largest forces in social gaming today would have gladly consumed ngmoco and called it a day. While opinions abound, rumor sources that Zynga politely declined after seeing the offer on the table. Zynga’s loss is clearly DeNA’s gain, and given the bank accounts backing DeNA up – the question is, in the long run, with Zynga’s decision not to buy ngmoco end up costing them more?