Learn with Strawberry Prince! An Amazingly Fun Study Book is Born! The Popular 2.5D Idol Group's "STUDY BOOK with Strawberry Prince: 5 Subjects for 6th Grade Elementary School" Announced for Release!

Gakken Co., Ltd. (Shinagawa, Tokyo / President and Representative Director: Tatsuya Nanjo), a group company of Gakken Holdings Co., Ltd. (Shinagawa, Tokyo / President and Representative Director: Hiroaki Miyahara), announced on June 5, 2026, the release of "STUDY BOOK with Strawberry Prince: 5 Subjects for 6th Grade Elementary School" (scheduled for release on August 6, 2026) and has begun accepting pre-orders.

Congratulations on 10 Years of Activity! A Fun Study Book to Learn 5 Subjects for 6th Grade with Strawberry Prince is Here!

"Strawberry Prince," a 2.5D idol group with immense popularity, active primarily on video distribution sites and social media.

A super fun study book is born, allowing you to learn with them as they celebrate their 10th anniversary on June 4, 2026!

Its name is "STUDY BOOK with Strawberry Prince: 5 Subjects for 6th Grade Elementary School."

Through the cheerful conversations of the Strawberry Prince members, this book makes it enjoyable to learn the key points of five subjects for the 6th grade of elementary school: English, Math, Japanese Language, Science, and Social Studies.

It's perfect for reviewing the entire 6th grade curriculum, and since all kanji from the 4th grade onwards have furigana, it's also ideal for "ahead-of-schedule learning." Each subject concludes with a "Summary Test" for a final check of your learning.

Furthermore, the cover design features a special illustration drawn exclusively for this book!

It's a special edition that fans must have.

▲Sample page for English. The lively pages, filled with illustrations, make learning fun!

Store-Limited Bonus Information

① Amazon Limited Bonus: Original Smartphone Wallpaper

https://www.amazon.co.jp/exec/obidos/ASIN/4053064317

② Miraiya Shoten Limited Bonus: Original Postcard

https://store.miraiyashoten.co.jp/Form/Product/ProductDetail.aspx?shop=0&pid=9784053064318

③ Kumazawa Bookstore Limited Bonus: Original Postcard

https://www.kumabook.com/comic_tokuten/160432/

*Each corporation offers one type of bonus.

*E-books are not eligible.

*Some stores are excluded for each bookstore.

*Bonuses are available while supplies last.

◉About "Strawberry Prince"

"Strawberry Prince" is a highly popular 2.5D idol group active mainly on video posting sites and social media. Their total number of social media followers exceeds 50.5 million (as of May 2026). They celebrated their 10th anniversary on June 4, 2026. ▶Strawberry Prince Official Website: https://strawberryprince.stpr.com/

▶Strawberry Prince Official YouTube: https://www.youtube.com/@StrawberryPrince

[Product Overview]

"STUDY BOOK with Strawberry Prince: 5 Subjects for 6th Grade Elementary School"

Price: 1,760 yen (tax included)

Scheduled Release Date: August 6, 2026

Format: B5 size / 144 pages

E-book version: Available

ISBN: 978-4-05-306431-8

Publisher: Gakken Co., Ltd.

Gakken Publishing Site: https://hon.gakken.jp/book/1130643100

[Pre-order/Purchase This Book Here]

・Amazon: https://www.amazon.co.jp/exec/obidos/ASIN/4053064317

・Rakuten Books: https://books.rakuten.co.jp/rb/18663946/

<E-book Version>

・Kindle: https://www.amazon.co.jp/dp/B0H1VYRW7G/

・Rakuten Kobo: https://books.rakuten.co.jp/rk/a527beafb70f39cd8cf9da0fcdab30e2/

Gakken Co., Ltd.

https://www.corp-gakken.co.jp/ ・President and Representative Director: Tatsuya Nanjo ・Date of Establishment: January 13, 2009 (Name change on October 1, 2022) ・Capital: 50 million yen ・Address: 2-11-8 Nishi-Gotanda, Shinagawa-ku, Tokyo 141-8416 ・Business Activities: Publishing and content business, global business, medical and nursing publishing content business, business for kindergartens and schools, classroom-related business, e-commerce and online business, advertising business.

GAKKEN HOLDINGS CO., LTD.

https://www.gakken.co.jp/ ・President and Representative Director: Hiroaki Miyahara ・Date of Establishment: March 31, 1947 ・Capital: 19,817 million yen ・Sales: 199.1 billion yen, Consolidated Subsidiaries: 82 companies (FY2025) Listed on the Tokyo Stock Exchange Prime Market (Securities Code: 9470) ・Address: 2-11-8 Nishi-Gotanda, Shinagawa-ku, Tokyo 141-8510 ・Telephone: 03-6431-1001 (Main) ・Business Description: A holding company established in 1946, engaged in education and medical/welfare-related businesses. Education Field: Classroom and cram school business including "Gakken Classroom," Publishing and content business such as learning materials, Business for kindergartens and schools, including textbooks and childcare supplies. Medical Welfare Field: Business for serviced residences for the elderly, Business for dementia group homes, Childcare support services such as nursery schools and after-school care. Global: Activities and business development in over 150 countries.