Natsume is the name of two video game publishers, Natsume-Atari and Natsume Inc., that were once the same company but are now completely separated.

Natsume Co., Ltd. was founded in Japan on October 20, 1987. It established an American division called Natsume Inc. in 1988. In 1995, Natsume Inc. split from Natsume Co., Ltd. to become an independent company. The name "Natsume" was retained by both companies in their respective countries. In 2013, Natsume Co., Ltd. renamed itself Natsume-Atari following a merger with its subsidiary Atari that year. Also in 2013, Natsume Inc. (the American company) inaugurated a Japanese division called Natsume Inc. Japan with no connection to its former parent company.

Natsume-Atari is based in Shinjuku, Tokyo, Japan and is known for developing licensed titles and mobile games. Natsume Inc. is located in Burlingame, California and is best known for publishing unique, family-oriented niche games, such as Harvest Moon and Reel Fishing.

[from Wikipedia]