Ougai Mori commands the Port Mafia, a criminal syndicate pivotal to preserving Yokohama’s fragile equilibrium through merciless pragmatism. Outwardly projecting the image of an ordinary middle-aged man, his veneer of civility conceals a cunning strategist who prioritizes calculated efficiency over sentiment. He navigates crises with icy composure, cloaking his ambitions behind formal courtesy to deflect suspicion and retain authority. A former military physician during the Great War, Mori weaponized Akiko Yosano’s healing gift to forge an immortal battalion, driving soldiers to psychological collapse through endless cycles of combat. The ordeal scarred Yosano permanently and cemented Mori’s willingness to sacrifice individuals for grander designs. Postwar, he collaborated with Yukichi Fukuzawa in an underground clinic before infiltrating the Port Mafia. His ascension followed the discreet assassination of its former leader, staged as a natural death, to restructure the organization under his control. Mori’s ability, *Vita Sexualis*, manifests as Elise—a youthful combatant summoned at will. Modeled after Yosano’s rebellious childhood persona, Elise embodies Mori’s morbid fixation on her unbroken spirit. Though bound to obey, she openly resents his whims, such as insistence on extravagant costume changes, unsettling observers. A master of indirect influence, Mori engineers conflicts to neutralize rivals while evading accountability. His deliberate leak of orphanage intel to André Gide catalyzed Sakunosuke Oda’s demise, Osamu Dazai’s departure, and Mimic’s destruction—a gambit that legitimized the Port Mafia through governmental collusion. His mentorship of Dazai faltered when he misjudged the protegé’s capacity for autonomous strategy, fracturing their alliance. As a leader, Mori grants autonomy to skilled operatives like Kōyō Ozaki and Chūya Nakahara, prioritizing organizational loyalty over short-term outcomes. He overlooks minor defiance if advantageous, exemplified by his patience with Ryūnosuke Akutagawa’s shortcomings, yet ruthlessly purges elements like smugglers that threaten Yokohama’s stability, adhering to Natsume Sōseki’s tripartite accord. Extended narratives explore his struggles to stabilize the Port Mafia’s finances while bolstering morale through rituals like New Year festivities. His fraught dynamic with Dazai persists, marked by the latter’s erratic suicide attempts—a testament to their unresolved history. Mori’s unsettling penchant for preadolescent girls, epitomized by Elise, draws contempt from allies like Fukuzawa. This trait, paired with his surgical detachment, cements his role as a morally ambiguous linchpin—reviled yet indispensable to Yokohama’s shadowed order.