Yuichi Kon

Nikkei, Inc. operates as a holding company with core business in newspaper publishing. It covers books, magazines, digital media, database service, broadcasting, and develops economic and cultural projects. The company was founded on December 2, 1876 and is headquartered in Tokyo, Japan.

DIAMOND, Inc. engages in publishing business. It handles publication of magazines, books and electronic contents such as CDs and DVDs. It also offers human development support projects and database services. The company was founded in May 1913 and is headquartered in Tokyo, Japan.

Part of Kadokawa Corp., ASCII Media Works, Inc. is a Japanese company based in Tokyo that offers a wide range of products and services, including literary books, light novels, comics, general books, learning materials, magazines, and more. The company is also involved in the production and distribution of TV shows, movies, and anime, as well as video software and game goods. Additionally, ASCII Media Works provides language books, dictionaries, and encyclopedias, as well as life and practical books, spiritual and self-development books, and PC and science books. The company is part of the Kadokawa Group, which offers a variety of products and services across different genres and categories.

Eventregist Co., Ltd. engages in the operation and management of EventRegist event platform. It provides announcement of events, monetary collection for the event and management of attendees. The company was founded in March 2011 and is headquartered in Tokyo, Japan.