How you spend your 30s, when 90% of your life is said to be determined. This book compiles practical tips for living a life without regrets and for growth, focusing on work, relationships, money, habits, and mindset. Authored by Shigehisa Nagamatsu, this is a textbook offering guidance for life, addressed to many people in their 30s. Condition: The book has been read once with a cover. There are no writings or markings. Please purchase only if you understand that it has been stored at home. Please check the details of the condition in the photos. Shipping: Waterproofing will be done with a plastic bag. Other: Instant purchase is OK. We do not offer price negotiations or dedicated listings.