Tetsuya Hosaka

Part of Watahan & Co., Ltd., Watahan Home-AID Co Ltd operates as a holding Japanese company with subsidiaries engaged in transport and management for distribution, grocery store management, and home improvement centers. The company is based in Nagano, Japan.

Part of Watahan & Co., Ltd., Watahan Trading Co., Ltd. is a Japanese company that wholesales drugs, clinical diagnosis reagent and chemical products. The company is based in Tokyo, Japan. The company was founded in 1965. Watahan Trading Co. was acquired by Watahan & Co., Ltd. on April 07, 2010.

Part of Watahan & Co., Ltd., Watahan Jmart Co., Ltd. manages home improvement centers in the Kanto-Koshin area of Japan. The Japanese company's mission is to enrich the lifestyle of all customers by supplying a wide range of products from all over the world. The company has expanded to 10 stores and continue to challenge themselves to make their store the only one loved by every customer by responding sincerely to their demands. Watahan Jmart Co. was acquired by Watahan & Co., Ltd. on November 4, 2016, for $1.31 million.

Watahan Mihara Shoten Co., Ltd. engages in the manufacture, retail and wholesale of tea and confectionery. The company was founded in 1874 and is headquartered in Azumino, Japan.

Science Home KK provides franchise services for detached houses. It also sells promotional materials and offer technical support for member stores. The company was founded on May 2, 2011 and is headquartered in Hamamatsu, Japan.

Rigna Co. engages in the operation and original product development of furniture and interior miscellaneous goods for showrooms; and management of online shops. It also provides the designing direction for specialty stores and offices, interior designing, interior coordination for living spaces, operation of lifestyle proposal type accessory shops and others. The company was founded on May 8, 2003 and is headquartered, in Tokyo, Japan.