Ron Kamonohashi is a master of his trade. As the year's best student at the renowned BLUE detective academy and with a 100% clearance rate, nothing stands in the way of his stellar career. But why does such a genius waste his talent and shut himself off from the outside world in his apartment? Detective investigator Totomaru Isshiki must first solve this mystery before he can enlist Ron's help in solving a series of mysterious murders. Because, unfortunately, the naive Toto himself absolutely lacks any combination talent ...