SK JAPAN Co., LTD. is a Japanese company founded in 1989. They create licensed soft toys, keychains, household goods and mobile phone accessories, available in Japan and internationally. In 2017, they started to produce merchandise for the Sonic the Hedgehog series.
The first Sonic related product by SK Japan was a mini bath ball which would contain either a mini figure of Sonic, Tails, Amy, Knuckles or Shadow. They released on 27 January 2017, for 500 yen each. The following months and year saw the release of more various products related to the series to release alongside special occasions such as the release of Sonic Forces and the twenty-seventh anniversary of the series. The products included keychains, plush toys, pouches, and cups.