In this fourth installment of the "Sherlock+Academy Logic" series, Tokyo is plagued by a dangerous game called "Crime RPG," where participants post crimes online, gaining levels based on views and ratings. Detective Misaki Fushizaki and her team investigate, aiming to arrest top-ranked player Phantom Thief Moon. Meanwhile, a former detective turned criminal grapples with his actions, adding complexity to the case. The story intertwines detective work with the dark allure of the "Crime RPG."