They provide an in-depth book review of Ryo Asai's novel, In the Mega Church, focusing on how it illustrates the "light and shadow" of marketing in contemporary Japanese society.

This emphasizes that the book uses "oshi-katsu" (fandom activities) as a lens to explore themes of loneliness, the power of narrative, and the craving for connection in modern life. Specifically, the analysis details how the novel portrays "Church Marketing" techniques—which treat fan communities as religious organizations—used by idol management to foster deep immersion, devotion, and high consumption among fans.

Through the perspectives of three main characters (the marketer, the immersed fan, and the former fan who turns to conspiracy theories), the it argues that the novel offers a high-resolution psychological examination of why people seek belonging through narratives and the ethical implications of using engineered stories to manipulate them. The review suggests that the book is an essential read for marketers and non-fans alike for understanding the mechanics of passionate consumer engagement and its often-painful psychological cost.