This analysis, titled "What You Don't Know About Japan," examines how changes in Japan's best-selling books reflect shifts in its society from 1991 to 2015. It argues that popular literature serves as a mirror to economic and social transformations, particularly during Japan's "lost decades." The author, Huang Yanan, who studied history and economics, chronologically links major political and economic events with top-selling titles, revealing how public concerns and collective thought evolved. The text is divided into three phases: the breakdown of the traditional group-oriented society (1991-1997), the transition to an individualistic society (1998-2007), and the emergence of social anxiety and right-wing ideology (2008-2015), with specific book examples illustrating each period's prevailing mindset.