This is a guidebook with maps of sea fishing spots in Tokyo, Chiba, and Ibaraki, compiled by Kunitoshi Toya, Tokio Yokomizo, Ryuji Hayashi, and Koichi Shimizu. It provides detailed explanations of each fishing spot, including the terrain and practical fishing tips. In particular, the information on natural and offshore reefs is likely based on the actual fishing experiences of Kunitoshi Toya, who is featured on the cover, and his firsthand knowledge gained from visiting these locations.