【OK for Solo Reading from Age 4】A Must-See for Parents Struggling with Children's "Why?" Questions! "Why Why!? Quiz Book 150" Released to Foster Thinking Skills!

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), released "Why Why!? Quiz Book 150: 3 Minutes a Day, Read Alone" on June 11, 2026.

Are you struggling with your child's "Why?" questions?

Do you sometimes find yourself replying "Later, honey" to a barrage of "Why?" and "How come?" questions from your child?

"Why Why!? Quiz Book 150" answers children's pure curiosities while nurturing their ability to think for themselves.

It's a book that will be a great help for a long time, from practicing "solo reading" starting at age 4 to sparking a "reading habit" for first and second graders! The explanations are simple and easy to understand, making it a book that children will eagerly read through.

3 Amazing Features!

① Readable Alone from Age 4! Packed with Photos and Illustrations!

If they can read hiragana, they can enjoy it on their own. Even when parents are busy, children can turn the pages themselves and read along.

② 150 Carefully Selected Questions! Full of "Why?"s Even Adults Don't Know

Includes a rich collection of 150 questions, ranging from simple everyday curiosities children feel to surprising facts that even adults will find "Oh, really!?" It's also perfect for quizzing each other with your child!

③ Your Travel Companion! Convenient Pocket Size

Its handy pocket size makes it a great companion for car rides or waiting times at the hospital. Reduce screen time and turn your child's bored moments into fun learning!

3 Curiosity-Sparking Genres!

【Animals】

A collection of "why?"s about animals, insects, fish, and dinosaurs!

Learn the secrets of their bodies and lives, like "Why is an elephant's nose so long?" Understand the reasons behind animal behavior and grow to love them even more.

【Body & Life】

Explores the "why?"s children feel about their own bodies and daily lives.

Easily explains the reasons behind common questions like, "Why do fingers get wrinkly after a bath?" It also includes quizzes about seasonal events you should know.

【Nature & Plants】

Picks up questions about plants and nature, such as "Why does an acorn wear a hat?"

Fosters awareness of everyday wonders, making walks and outdoor play more enjoyable.

Cultivate Thinking Skills and Reading Habits in Just 3 Minutes a Day

Full of features for easy enjoyment in short bursts! The explanations are right below the questions on each page, allowing children to experience the joy of discovering "I see!" on their own.

With fun, chuckle-worthy quizzes, it draws out the pleasure of reading and supports the first step towards a lifelong reading habit!

[Product Overview]

"Why Why!? Quiz Book 150: 3 Minutes a Day, Read Alone"

Supervisors: Yoshimi Ojima, Shishiki Kato

Price: 1,320 yen (tax included)

Release Date: June 11, 2026

Format: B6 / 160 pages

E-book: Available

ISBN: 978-4-05-206306-0

Publisher: Gakken Co., Ltd.

Gakken Publishing Site: https://hon.gakken.jp/book/1020630600

[Purchase this book here]

・Amazon: https://www.amazon.co.jp/dp/4052063066

・Rakuten Books: https://books.rakuten.co.jp/rb/18591408/

Gakken Co., Ltd. (Gakken Inc.)

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, EC and online business, advertising business.

Gakken Holdings Co., Ltd. (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 (Fiscal Year ending September 2025)

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 (General Inquiries)

・Business Description: A holding company engaged in education and medical/welfare-related businesses since its founding in 1946.

Education Field: Classroom and cram school business including "Gakken Classrooms", publishing and content business such as learning materials, business for kindergartens and schools including textbooks and childcare supplies.

Medical Welfare Field: Business for serviced housing for the elderly, dementia group home business, childcare support services such as nursery schools and after-school care.

Global: Activities and business development in over 150 countries.