“Please listen. This year, a great calamity will befall this country from the west.” Princess Alfina receives an ominous prophecy in a peaceful kingdom. However, her words are ignored due to her lineage as a despised rebel. The protagonist, Ricardo, who was reincarnated from a college student in the economics department to a merchant’s child, struggles against the interference of powerful merchants in a class-based society. He quickly earns the animosity of his peers at the academy where he sought information. It was Alfina who protected Ricardo. Ricardo, who tries to distance himself from a volatile person like a princess, is criticized by his childhood friend for being “easily fooled despite acting like a strategist,” and he becomes entangled in the princess’s prophecy. “The plausibility is not the issue. What matters is how to obtain data that can verify the success or failure of a hypothesis.” Against the prophecy that only shows the aftermath and not the source of the calamity, Ricardo uses his knowledge of modern concepts to unravel the mysteries of magical disasters.