Index Holdings, which recently merged with publisher Atlus, has announced profits of ¥437 million (£3.42m) for the fiscal year ending August 31.
During the financial year ending August 31, 2009 the company posted a loss of ¥104 million (£815,419) for its North American division. The increase is attributed almost entirely to strong sales of RPG Demon's Souls in the region.
Sales increased from ¥2.732 billion (£21.4m) to ¥3.299 billion (£25.86m) in North America between the two years.
Atlus also publishes the long-running Shin Megami Tensei series of RPGs and is due to make its first cross-platform PS3 and 360 release, with the controversial title Catherine, early next year.
Recently, Demons' Souls developer From Software announced that a sequel is in the works, codenamed Project Dark.