Senri Kuroki, a biracial Eurasian operative with striking crimson hair, leverages her distinct appearance to excel in covert missions. Employed by British Ambassador Parks under the alias "Mary Blackwood," she masquerades as a freelance journalist for an Edo newspaper, infiltrating factions to extract vital intelligence. Her tactics include eliciting confessions from imprisoned suspects, such as exposing a geisha’s clandestine arms distribution and assassination timetables. Her espionage intertwines with pivotal crises—unraveling opium-smuggling syndicates and thwarting plots to undermine the Meiji regime. Adept at disguise, she maneuvers through Edo’s underworld with shifting identities, evading suspicion while executing objectives. Though her paths occasionally cross with allied agents, her loyalty remains unwaveringly tethered to her employers’ strategic aims.