This book explains the psychology to reduce stress in interpersonal relationships. Although it is new and unread, please refrain from purchasing if you are sensitive to items stored at home. - Title: Human Observation: Mastering It Erased My Worries - Author: Mayako Kurahashima - ISBN: 978-4-7991-0895-1 - Content: Psychology to drastically reduce stress in interpersonal relationships - Features: Clearly understands the "why?" of people Thank you for looking.