New Era releases a collaboration cap with the anime “The Strongest King Encyclopedia”! The children’s book series “Saikyō Zukan,” which inspired the anime, has sold over 6 million copies.
Gakken Holdings Co., Ltd. Press release: September 5, 2025 To Members of the Press New Era releases a collaboration cap with the anime “The Strongest King Encyclopedia”! The children’s book series “The Strongest King Encyclopedia,” which inspired the anime, has sold over 6 million copies. New Era will release caps featuring popular characters from the “The Strongest King Encyclopedia” anime series on Sunday, September 7th! Tyrannosaurus and lions are recreated with intricate and beautiful embroidery. Gakken Holdings Co., Ltd., a group company of Gakken Holdings Co., Ltd. (Shinagawa, Tokyo / President and CEO: Hiroaki Miyahara), The “Strongest King Encyclopedia” series, a hugely popular children’s book published by Gakken (Shinagawa, Tokyo; CEO: Tatsuya Nanjo), has sold over 6 million copies. The TV anime series, “Strongest King Encyclopedia,” based on the “Strongest King Encyclopedia of a Different Species” series, is collaborating for the first time with New Era, a global sports and lifestyle brand, to create four new cap designs, which will go on sale from Sunday, September 7, 2025.
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https://prcdn.freetls.fastly.net/release_image/2535/8106/2535-8106-17688277a554b756f78387d4c23013c2-2000×2000.jpg Price: ¥6,600 (tax included) ［Youth 9FIFTY(TM)］
https://prcdn.freetls.fastly.net/release_image/2535/8106/2535-8106-53cdf7dd13576ec4753a12595fa06d9c-2000×2000.jpg Price: 4,950 yen each (tax included)
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https://prcdn.freetls.fastly.net/release_image/2535/8106/2535-8106-1c43eeb757b5e1c720fa1fe0860e40b0-2000×2000.jpg [TV Anime Overview] ■ Strongest King Encyclopedia ~The Ultimate Tournament~ ●Broadcast Information Airing every Sunday from 7:15 AM on six TV Tokyo affiliates (TV Osaka, TV Aichi, TV Setouchi, TV Hokkaido, and TVQ Kyushu Broadcasting) Also available on various video streaming services ●Staff Original work: Gakken’s “Illustrated Guide to the Strongest Kings of Different Species” General Supervision: Gakken “Strongest King Encyclopedia” Editorial Department/Tetsuya Meguro General Director: Kunihiko Yuyama Director: Makoto Sato Series Composition: Shinji Sato Character Design: Imai Toons Sound Director: Kisuke Koizumi Music: Yasuharu Takanashi / Johannes Nilsson / Team-MAX Animation Production: OLM Digital Original creature design: Nanbakibi Original collaboration: Tatsuro Saneyoshi / G. Masukawa / Nobuaki Takebe / Lucia Nanami / Live ●Cast Mr. Most: Yoshihisa Kawahara TT: Mie Sonozaki ●Copyrights (C)Gakken/Sai-Kyo-Oh/TX ▶Anime Strongest King Encyclopedia Official Website:https://saikyoohanime.com/ ▶ Strongest King Encyclopedia Series Official Website:https://saikyooh.gakken.jp/ [About the Strongest King Encyclopedia] The “Strongest King
Encyclopedia” series (published by Gakken) began with “Strongest Animal Encyclopedia,” published on June 12, 2015. This series is a simulation battle encyclopedia created with the concept of “pitting fierce warriors from various genera, such as the animal and dinosaur kingdoms, against each other in a tournament to determine the strongest.” The battles between not only real-world creatures like animals, extinct animals, insects, and dinosaurs, but also mythical creatures like gods, heroes, monsters, and mythical beasts from myth and folklore, spark the imagination of readers wondering, “Who is the strongest, after all?” and have earned the series a passionate following, especially among elementary school students. The series has sold over 6 million copies (as of September 2025) and is continuing to expand with manga, tag-team stories, and more. The anime “The Strongest King Encyclopedia ~The Ultimate Battles~,” which began airing in January 2024, was well-received, and a new series with a longer broadcast time, “The Strongest King Encyclopedia ~The Ultimate Tournament~,” began airing on six TV Tokyo affiliates in April 2025. The latest volume in the encyclopedia series, “The Strongest Underwater King Encyclopedia PFP,” is now on sale and receiving rave reviews. This encyclopedia determines the strongest underwater creature by comparing creatures of equal weight. [Product Overview]
https://prcdn.freetls.fastly.net/release_image/2535/8106/2535-8106-02faa24dc5014fa211405a7c5e635b00-1904×2700.jpg ■“Heterogeneous Strongest King Encyclopedia” Supervised by: Tatsuro Saneyoshi, Illustrations by: Nanba Kibi Price: ¥1,320 (tax included) Release date: July 18, 2019 Format: A5/144 pages Electronic version: Yes ISBN: 978-4-05-205070-1 Publisher: Gakken Inc. Gakken Publishing Website:https://hon.gakken.jp/book/1020507000 【Purchase this book here】 ・Amazon:https://www.amazon.co.jp/dp/4052050703/ ・Rakuten Books:https://books.rakuten.co.jp/rb/15941061/ ・Seven
Net:https://7net.omni7.jp/detail/1106998864/
https://prcdn.freetls.fastly.net/release_image/2535/8106/2535-8106-dd11753dbf5d2cc7d313476b7f905e00-847×1200.jpg ■ “PFP: The Underwater King’s Encyclopedia” Supervision: G. Masukawa Illustrations: Taro Yamazaki Price: ¥1,430 (tax included) Release date: July 24, 2025 Format: A5 / 144 pages Digital version: Available ISBN: 978-4-05-206155-4 Gakken Publishing
Site:https://hon.gakken.jp/book/1020615500 【Purchase this book here】 ・Amazon https://www.amazon.co.jp/dp/4052061551/ ・Rakuten Books https://books.rakuten.co.jp/rb/18231207/ ・Seven Net
https://7net.omni7.jp/detail/1107620378/ ▶Official
website:https://saikyooh.gakken.jp/
■Gakken Inc. https://www.corp-gakken.co.jp/ ・President and CEO: Nanjo Tatsuya ・Date of incorporation: January 13, 2009 (company name changed on October 1, 2022) ・Capital: 50 million yen ・Address: 2-11-8 Nishigotanda, Shinagawa-ku, Tokyo 141-8416 ・Business activities: Publishing and content, global business, medical and nursing publishing content, kindergarten and school business,
classroom-related business, e-commerce and online business, and advertising business. ■GAKKEN HOLDINGS CO., LTD.
https://www.gakken.co.jp/ ・President and CEO: Hiroaki Miyahara ・Date of incorporation: March 31, 1947 ・Capital: 19,817 million yen ・Sales: 185.5 billion yen, 79 consolidated subsidiaries (fiscal year ending September 2024) Tokyo Stock Exchange Listed on the Prime Market (Stock Code: 9470) ・Address: 2-11-8 Nishigotanda, Shinagawa-ku, Tokyo 141-8510 ・Telephone: 03-6431-1001 (Main) ・Business Description: Holding company established in 1946, engaged in education, medical care, and welfare-related businesses. Education Sector: Classroom and cram school operations, including “Gakken Classroom,” Publishing and content business, including educational materials, Preschool and school operations, including textbooks and childcare supplies, Medical and Welfare Sector: Serviced housing for the elderly, Dementia group homes, Childcare support services, including nurseries and
after-school programs, Global: Activities and operations in over 150 countries.