This is a set of four books that will help you with self-improvement, ways of thinking, and how to use language. This set allows you to read content useful for work, daily life, and relationships all at once. [Set Contents] ・Insights Gained in My 20s ・Words You Can Use to Rephrase for Life ・100 Habits of People Who Are Liked for Some Reason ・How Successful People Think These books mainly offer hints on thinking, habits for taking positive action, and content to improve communication skills. Recommended for people of all ages. [Condition] ・Used books ・No writing or tears found (amateur inspection) ・There may be some scratches and signs of use on the cover and corners *Please check the photos for the condition [Notes] ・Sold as a set of 4 (individual sales not possible) ・Please purchase only if you understand that these are used items, as they are stored at home.