KADOKAWA Summer WaterChallenge Book Fair 2026 is Now Live! Buy 'WaterChallenge' Titles at Bookstores and Enter to Win Exclusive Goods!

KADOKAWA Corporation (Headquarters: Chiyoda-ku, Tokyo; Director, Representative Executive Officer, President & CEO: Tsuyoshi Natsuno) will host the 'KADOKAWA Summer WaterChallenge Book Fair 2026 ~Apologizing Teacher Challenges Reading!~' on the KADOKAWA app from Monday, June 15, 2026, to Monday, August 31, 2026.

By purchasing one eligible 'WaterChallenge' book published by KADOKAWA at a bookstore and entering the campaign, participants will have a chance to win luxurious prizes through a lottery—56 winners in total will receive signed goods and original merchandise.

We encourage everyone to participate.

Receipt Submission Period

0:00 JST, Monday, June 15, 2026 – 23:59 JST, Monday, August 31, 2026

※ Please submit your receipt to the app within one week of purchase.

Prize Details

Total of 56 winners selected by lottery (each entry requires 135 points)

■ Prize A: Signed WaterChallenge T-shirt – 1 winner

※ Adult size L

■ Prize B: Signed WaterChallenge Books – 1 winner each

※ You may choose one signed book from the following five titles at the time of entry:

'Let’s Play WaterChallenge and Minecraft!', 'WaterChallenge Official Fan Book',

'WaterChallenge Game Book: Investigate the Minecraft Urban Legends!', 'Learning How to Get Along with Friends with WaterChallenge',

'Let’s Learn with WaterChallenge! 125 Proverbs'

■ Prize C: WaterChallenge Original Acrylic Keychain (doubles as a stand) – 50 winners

Campaign Entry Overview

■ How to Enter

(1) Purchase one eligible book at a bookstore

(2) Download the KADOKAWA app

(3) Tap 'Receipt Submission' and upload your receipt and the book’s barcode to the KADOKAWA app within one week of purchase

(4) Use 135 accumulated points to enter the lottery

■ Eligible Books

'WaterChallenge' titles published by KADOKAWA

※ For the full list of eligible books, please check the campaign website or the KADOKAWA app.

※ Points earned vary based on the book’s cover price (135 points = one entry)

※ Purchases not at full price or digital editions are not eligible.

■ Eligible Bookstores

Physical bookstores nationwide

※ Online orders are not eligible. However, purchases made online but paid in-store may qualify. Please refer to the app’s terms and help section for details.

■ Important Notes

You earn points equal to 10% of the book’s cover price per purchase (rounded to the nearest whole number).

Only one identical item per purchase qualifies for points.

Winners will be notified by prize shipment (scheduled for late November 2026) — shipping limited to Japan.

Acceptance and winning require that prizes not be transferred (including resale or auction listing). If transfer is detected, the win will be voided and the prize must be returned.

Personal information provided during entry will be handled in accordance with our privacy policy.

KADOKAWA App Requirements: iOS 16 or later, Android 11 or later. Subject to change; please confirm via your app store. Some devices may not function properly.

For more details, please refer to the official campaign terms in the KADOKAWA app.

▼ Download the KADOKAWA App Here

https://kdq.jp/je46g

Or scan the QR code below

Copyright Notice

When covering this campaign, please include the following copyright notice:

©WaterChallenge2026
©UUUM

Related Information

'KADOKAWA Summer WaterChallenge Book Fair 2026' Campaign Website

https://yomeruba.com/campaign/present/entry-195129.html

Yomeruba – A Treasure Trove of Children’s Book Information

Yomeruba is a web platform operated by KADOKAWA’s Children’s Book Editorial Department, designed for children to safely and enjoyably engage with books.

It features picture books, manga learning series, Tsubasa Bunko, character books, and more—content for ages 0 to upper elementary school. We continuously add new content such as previews of upcoming books, the latest book news, quizzes, and reviews—making reading, learning, and playing fun and accessible.

We encourage families to use Yomeruba as a place where children can discover the joy of reading and interacting with books.

▼ Yomeruba Official Website

https://yomeruba.com/

▼ Official X (formerly Twitter) 'Yomeruba (KADOKAWA Children’s Book Editorial Department)'

@KadokawaJidosho

▼ Official Instagram 'Yomeruba'

@yomeruba_kad

▼ Official YouTube 'KADOKAWA Children’s Book Channel'

https://www.youtube.com/channel/UC4UqzID_eubKyb4O0bxnCgA