TAC Publishing This is a new, unused item. (I bought this with full enthusiasm, but it turned out I wouldn't be taking the course.) This textbook is divided into four booklets by subject. There are YouTube videos by Professor Nakamura, the author, explaining the content, and the text uses many illustrations and characters, making it easy to understand even for beginners. I am also selling the past exam questions from the same "Sukiri" series, so you may want to purchase them as a set!