"Mental Instruction Manual to Turn On the Happiness Switch" Emma Hepburn / Chisato Kimura Price: ¥1870 "Mental Instruction Manual to Increase Your Mental Capacity" Emma Hepburn / Chisato Kimura Price: ¥1760 Everyone has moments of uncertainty, and by reading these two books together, you can consider both 'what you can do for happiness and how to be' . Set of 2 books (not sold separately) Price: ¥3,630 for both Condition: Please check the photos. I purchased them from Amazon, and they had some corner wear and creasing on the back cover from the time they arrived. I'd like to sell them to someone who doesn't mind these imperfections.