Yasushi Shiina

Part of Kadokawa Corp., Kadokawa Group Publishing Co., Ltd. is a literary book publisher and media company based in Tokyo, Japan. The Japanese company offers a wide range of products and services including books, magazines, movies, animations, games, and more. The company's website provides information on their products and services, as well as news releases, company profile, philosophy, investor relations information, and initiatives to achieve the SDGs and digital transformation. One of their popular learning reference books is "Grammar Book Created by Gachan-chan English Kimi".

Part of Kadokawa Corp., Kadokawa Production Co., Ltd. engages in copyrighting of animated television series. The company is based in Tokyo, Japan.

BOOK WALKER Co., Ltd. engages in the production, distribution, and sales of electronic content including e–books and video streams. It publishes books, magazines, comics, and journals through the Internet. The firm also develops software applications for games, novel distribution, and mobile devices. The company was founded on December 1, 2005 and is headquartered in Tokyo, Japan.