Kiichiro Nagatani

Part of Gakkyusha Co., Ltd., Inter-Edu.com, Inc. is an examination and education information site based in Tokyo, Japan. The site provides word-of-mouth information on various examinations such as junior high school, high school, university, elementary school, kindergarten school information, and cram school information. It also offers high school rankings for those who have passed the University of Tokyo, Kyoto University, and other difficult universities. The site provides useful information for children of examinees and those worried about taking the exam. Additionally, it operates a full-time junior high school, high school, wide-area communication/unit high school, which is a traditional junior high school in 134 years. The current number of students is about 2200 in total (as of March 2023). The school aims to foster human resources who can respond to rapid social changes under the slogan of "sakura innovation -21st century education-".

Part of Nagatanien Holdings Co., Ltd., Nagatanien Co. Ltd. is a Japanese company that provides customers with safe and high-quality products. The company is based in Tokyo, Japan. The company's philosophy is centered around the spirit of "hito hito".

Prince Hotels, Inc. owns and operates hotels and resorts. It also operates golf courses in Japan, Hawaii, and Alaska. The firm is a subsidiary of Seibu Holdings, Inc. The company was founded on June 4, 1956 and is headquartered in Tokyo, Japan.

Rickie Business Solution Co., Ltd. provides business advisory services. Its services include consulting, education, training, local creation support, business support, business matching, publishing, and media. The company was founded by Koichi Shibuya in May 2002 and is headquartered in Tokyo, Japan.

Part of Nagatanien Holdings Co., Ltd., Sun-Flex Nagatanien Co., Ltd. is a company based in Iwaki, Japan that specializes in the production and distribution of chilled pork from Passion Pigs, Kishu Umebuta, and Wakayama Prefecture. The Japanese company prioritizes safety and security in their production process and also offer wholesale and EC sales of domestic and imported livestock raw materials and processed products. The company's proprietary feed, which includes plum vinegar feed "Kishu Umesodachi," is used to grow their pork, including the Inobuta and Durock species, which are known for their strong fat sweetness and richness.

Marubeni Energy Corp. operates oil terminals and service stations. The firm offers petroleum, gas, nuclear energy and coal products. The company was founded on June 22, 1976 and is headquartered in Tokyo, Japan.