Z-kai Inc. (Location: Mishima City, Shizuoka Prefecture, President: Takao Fujii), a group company of Masu-kai Holdings Inc. (Z-kai Group), is pleased to announce that its "Z-kai Books" Sokudoku Eitango series has been newly listed on the Furusato Nozei donation gift website for Mishima City, Shizuoka Prefecture, starting June 26, 2026. Since 2018, our headquarters has been located in Mishima City, and with the group philosophy of "Opening the Future with the Best Education," we provide a diverse range of educational services, including "Z-kai Correspondence Education," to a wide range of age groups from children to university students and working adults. In July 2025, we began offering "Grade Up Problem Collection" and "Thinking Skills Expansion Workbook for Elementary School Students" as donation gifts for the city. Now, with the desire to further contribute to regional revitalization and support learners nationwide, we have decided to add the "Sokudoku Eitango" series, which has been supported by learners, including exam students, for many years. Through this initiative, we will continue to provide optimal educational services and materials to as many customers as possible. Outline of Added Donation Gifts "Sokudoku Eitango" Series The "Sokudoku Eitango" series is a vocabulary book that has been supported by many university entrance exam students for many years. By learning words within English sentences, students acquire "usable" vocabulary skills. With the philosophy of "wanting students to learn English as a tool to logically grasp opinions and matters and express them persuasively," this series, even after more than 30 years since its publication, continues to be revised and has achieved over 9.8 million copies shipped cumulatively, making it an "ever-evolving classic" that receives No. 1 support from exam students. ※ Kinokuniya Bookstore Chain, High School Academic English Vocabulary/Idioms Category, Cumulative Series Sales (Period: January 2000 - April 2026)