[Best Time-Performance] The long-awaited 4th installment of the 'Understand in 5 Seconds' series! 'Katakana Word Encyclopedia' released on May 28.

Gakken Inc. (Shinagawa, Tokyo; President: Tatsuya Nanjo), a group company of Gakken Holdings Co., Ltd., released 'Understand in 5 Seconds: Katakana Word Encyclopedia' on May 28, 2026. This is the 4th installment following the hit 'Understand in 5 Seconds: Proverb Encyclopedia.' The theme of this book is 'Katakana words.' Even difficult terms can be mastered in 5 seconds with the series' signature clarity. It takes only 5 seconds per word; by looking at the paraphrasing and illustrations, you can grasp the meaning immediately. Even those who dislike reading or studying will find it accessible. With concise explanations and illustrations by popular artists, it is designed to stick in your memory. The book also includes mini-puzzles at the end of each chapter. A reader survey is currently being conducted on the special series website.