This book explains the mysteries of human psychology, allowing you to deepen your understanding of psychological states. I purchased it at a bookstore and have only read it once. - Title: The Book of Understanding the Mysteries of Human Psychology - Author: Yuki Kiyota - Publisher: Tamagawa University Press - Price: 847 yen - ISBN: 9784837967989 - Content Features: Includes explanations of psychological states Thank you for looking.