Master detective Rock Yodogawa is a middle school prodigy with an IQ of 250 who sees the world as a web of puzzles waiting to be solved. Alongside his fearless partner June, his loyal dog sidekick Rokubei, and a rotating cast of companions including Liu, Mutsuki, and the eccentric Professor Hex, Rock takes on baffling cases that demand sharp logic and a firm grasp of mathematics. The volume contains two back-to-back full-color adventures. In the first, Rock and his team pursue the elusive Phantom Thief Kubrick, a rival who leaves a trail of codes and traps that can only be unraveled through integers, ratios, and number patterns. In the second, the group journeys to the perilous Serpent River, where they must navigate treacherous terrain and break ancient curses by applying concepts such as area, volume, and proportional reasoning. Every twist of the plot requires the characters to solve real math challenges, and the narrative frames each problem as a necessary step toward outsmarting adversaries and uncovering hidden truths. The setting is a lively, modern world where mystery and adventure lurk in everyday places, from city streets to remote wilderness, and where math is treated not as a dry subject but as the essential tool for cracking any case. The storylines emphasize humor, logical thinking, and a spirit of inquiry, blending educational content with an engaging detective format designed for readers in grades six and seven.