The company was founded in April 2004 by Dean Morgan, with the first school opening on July 14, 2004, in Nishi-Shinjuku, offering English and French lessons.

[1] In September 2006, the Sala school brand was acquired and absorbed as a subsidiary of Dean Morgan K.K., providing one-to-one and group lessons at two locations in Umeda and Namba, in Osaka.

[5] In April 2017 a majority 59.8% ownership stake was purchased by Link and Motivation Group (TSE: 2170) and the home office was moved to the 12th Floor of the Ginza 6 building.

The company operates Rosetta Stone Learning Center schools in Tōhoku, Kantō, Chūbu, Kansai, Chūgoku, Shikoku, and Kyushu.

The company also runs a Rosetta Stone Premium Club school previously at Ginza Six and was relocated to Kabukiza Tower as of October 2021.