This is the high school year 2 mathematics textbook from Teru-ryokukai. It was primarily used for homework at Teru-ryokukai. Each unit contains around a dozen or so problems, along with their solutions and explanations. Although it's a textbook distributed in the second year of high school, it's a high-level textbook that even Teru-ryokukai students revisit and work through again in their third year. Because it has a large number of problems, I used it to focus on the units I struggled with. Please note that the class and name sections have been blacked out with a marker. There are no other markings or writings in the book.