史上最強の人生戦略マニュアル (Tankobon Hardcover)

I'm curious about the personal experiences or research that led to the development of these particular methods. Did any real-life stories influence the core advice?

Some tips seem straightforward, but I wonder if others struggled with consistency or adapting them to different circumstances. What worked or didn't work for others?

I'm interested in whether readers felt these methods are more practical or sustainable than other popular techniques, and what makes them stand out.