Over 8 million copies in the series have been sold! The definitive guide for kanji proficiency, learning assigned kanji one character at a time with a kanji chart, perfect for exam preparation! This book is packed with features to develop comprehensive kanji skills. --------------------------------------------- ・Estimated duration: 30-48 days per book ・Estimated time: 30-50 minutes (4 pages per step) ・Number of questions: Approximately 3400 ・Number of pages: 224 pages