Osamu Ishizuka, a biologist who is bigoted and hates people, is so "insect-loving" that he even calls himself a "ground beetle." His clear mind and knowledge of insects will solve the mystery of the difficult case! The most prosperous creature on earth? ? insect. In front of the ecological diversity, everything such as human behavior can be seen through! A unique mystery that leads to the true culprit by comparing the psychology of the culprit's behavior to that of an insect! !