Koichi Ishizuka

Photozou Koukoku Co., Ltd. engages in the management of photo sharing site Photozou. The company was founded in August 2016 and is headquartered in Tokyo, Japan.

Zentrum Holdings, Inc. operates as a holding Japanese company that provides telecommunications services. The private company is based in Tokyo, Japan and has subsidiaries in Japan. Zentrum Holdings was founded in 2019 by Koichi Ishizuka, who has been the CEO since 2019.

Part of OFF Line International, Inc., OFF Line Japan Co., Ltd. is a group of young entrepreneurs and engineers who provide smart solutions to all-scale companies. The company is based in Tokyo, Japan. The Japanese company is confident in unmatched services and want to contribute to the future with groundbreaking ideas.

Next Meats Co. Ltd. is a Japanese food-tech venture company that specializes in the research, development, and production of premium Japanese-style alternative meat products made with non-GMO soybean protein. Next Meats is based in Shinjuku, Japan, and has a production line in Taiwan, as well as a joint development contract with Hung Yang Foods of Taiwan and a partnership with Toyota-Tsusho Corporation. Established in 2020, the private company offers a range of products, including plant-based yakiniku short-rib and skirt-steak, beef bowl, chicken, burger patties, pork, tuna, and milk for both professional and family use. The company is rapidly expanding its business to other countries, focusing on delivering a sustainable environment to the next generation. The company was founded in 2020, and the CEO is Hideyuki Sasaki.

Part of White Knight Inc., WB Burgers Japan Co., Ltd. is a Japanese company that operates restaurants. The company is based in Tokyo, Japan. The company was founded in 2021. Koichi Ishizuka has been the CEO of the company since 2021. WB Burgers Japan Co. was acquired by White Knight Inc. on September 14, 2021.

Part of White Knight Inc., Mama Foods Co., Ltd. is a Japanese company that manufactures and sells healthy foods such as okara konjac in Iwate Prefecture. The company is based in Hanamaki, Japan. The company offers side dishes that are particular about the seasonal ingredients of the mail order distribution party "daily side dishes". The company was founded in 1958. The CEO is Koichi Ishizuka.