Discover Japan's stories—across time, across language.

| Original Title | 暗号数字 |
|---|---|
| Author | 海野 十三 |
| Genre | Detective & Mystery |
| Author Type | Male Author |
| Summary | In the shadowy world of espionage, Detective Homura Sōroku resurfaces after a prolonged absence, his once-flamboyant persona replaced by the guise of an unremarkable middle-aged man—a necessity for infiltrating the clandestine networks of a formidable anti-government organization. Entrusted by a high-ranking official, Homura embarks on a race against time to unravel a six-digit cipher key, its monthly shifts threatening national security. Clues hidden in plain sight—advertisements, billiard halls, and distant city landmarks—lead him through a labyrinth of ultraviolet-inked riddles and mathematical enigmas. Each step demands razor-sharp intellect as he deciphers division problems etched into mirrors and posters, pursued by unseen adversaries who risk everything to protect their secrets. From Tokyo’s bustling streets to rural train corridors, Homura battles exhaustion, sabotage, and his own limits, aware that one misstep could doom his mission. As days dwindle and tensions mount, the detective’s resolve is tested in a high-stakes game where minds clash and loyalties blur. Will his brilliance crack the code, or will the shadows consume him? |