. This article aims to investigate the ability of the P4C Reading of the Little Black Fish (Mahi Koucholou-ye Siyah) story by Samad Behrangi. The current research aimed to measure philosophical adequacy in two studies. In the first study, the effectiveness of the Little Black Fish story on children's aggression was measured. The research method was semi-experimental with pre-test & post-test, a control group, and a follow-up group. The experimental group was taught philosophy to children during 9 sessions of 120 minutes, but the control group did not receive any intervention. Eysenck and Wilson's Children's Aggressive Attitude Scale designed for elementary school, was used as a tool. The subjects included sixth-grade students in the academic year 2023-2024. Data analysis was done using the covariance analysis (ANCOVA) method. The second study examined the philosophical adequacy of the story in terms of both form and content. The findings revealed that The Little Black Fish significantly influenced children’s aggressive attitudes (Ƞ^2 = .17). Additionally, the results indicated philosophical inadequacies in the story’s content and form. Both studies indicated that the story of the little black fish has philosophical inadequacies from the point of view of controlling aggression in the community of philosophical inquiry.