"Why Optimists Succeed: How to Cultivate Optimism, as Taught by the Father of Positive Psychology" by Yoshiko Yamamura / Martin Seligman Price: ¥1300 I purchased this about three years ago when writing a university report. I've read it a few times, but there are almost no scratches or stains. Also, there are no markings. ⚠️Please refrain from purchasing if you are sensitive to items stored at home. 〇Instant purchase is welcome. 〇Price negotiations are accepted in the comments section.