Bungou Stray Dogs: STORM BRINGER

Chuya Nakahara, a year into his time with the Port Mafia, is working toward a leadership role. His ambitions are interrupted by the arrival of Paul Verlaine, who identifies himself as Chuya's younger brother and threatens to kill those Chuya cares about. To prevent this, Chuya partners with Adam, an artificial intelligence investigator from Europe, to stop Paul before another catastrophe strikes Yokohama.