This is "The Textbook of English Grammar You'll Never Forget Once You Read It," written by Tomokazu Makino and published by SB Creative. It's a practical book structured to help you understand six years of junior high and high school English grammar through stories. It's useful for relearning English and building a foundation for qualification exams. The book's dimensions are 21cm in height and 14.8cm in width. Regarding the condition of the item, there is a slight crease on the edge of the cover, but there are no markings inside, and it does not affect readability. Overall, it is in clean condition with no noticeable stains.