This is a Grammar Building textbook from Waseda Academy. It includes the answers and explanations. This copy has some wear and tear, with some writing inside, but is in good condition. Although it is not the latest edition, the content of the textbook is almost the same every year. You are welcome to purchase this item immediately. Please consider that this is a used item that has been handled by another person. Please refrain from asking questions about the product or requesting a price reduction after purchase. We cannot accept cancellations, complaints, returns, or refunds after purchase.