In the tranquil city of Yokohama, a recent disturbance unfolded with the emergence of two elusive criminals capturing the attention of both the police force and detectives alike. These nocturnal phantom thieves, linked by the cryptic calling cards strategically placed in law enforcement offices, embarked on daring heists that left the city bewildered.

Akutagawa Ryuunosuke, a revered detective known for his unwavering resolve, found himself assigned to dismantle 'The White Diamond,' as the locals had come to dub one of the enigmatic thieves. His icy demeanor and formidable track record of solving 100 cases with minimal hitches marked him as a seasoned investigator. However, facing this new adversary posed a unique challenge; 'The White Diamond' operated with unprecedented speed and stealth, opting for selective thefts of paintings and gemstones during each audacious heist.

Navigating the dimly lit streets of Yokohama, Akutagawa pursued his elusive prey. Street lamps cast a feeble glow, providing the only warmth amid the darkness. The criminal, agile and elusive, raced ahead, yet Akutagawa anticipated their destination – a dead end. Coming to a sudden halt at the entrance of the alleyway, his shoes echoed on the cold concrete. Deep breaths preceded a subtle smirk as he clutched his briefcase tightly, unwavering eyes fixed on the shadowy figure.

In the hushed atmosphere, Akutagawa's voice pierced the silence, declaring with a mix of determination and satisfaction, "I've caught you now..."