Please generate a high-design character relationship map poster based on {argument name="theme" default="Demon Slayer"}. This image should not be a simple illustration, but a character relationship map that combines information visualization, narrative structure, poster design sense, and stylistic fidelity. Please automatically complete the following: - Identify the work and core settings corresponding to the theme - Extract the most representative 6–12 key characters, not exceeding 15 if necessary - Identify and display key character relationships, including blood ties, romance, friendship, alliances, hostility, master-disciple, etc. - Automatically choose a composition method based on the work's characteristics, such as protagonist-centered, dual-core confrontation, faction-based, family tree, or chronological evolution - Automatically refine the work's style DNA, including color, worldview symbols, textures, mood, typography, and representative elements - Transform these stylistic elements into an overall visual design for the relationship map, rather than simply copying an official poster - Use different colors, line types, and arrows to distinguish different relationships, ensuring clear lines and layers without clutter - Make core characters most prominent, followed by important characters, and subordinate characters weakened to form a clear visual hierarchy - Ensure every character name is legible, with identity or faction labels if necessary The final product should satisfy: - Immediate understanding of character hierarchy and key relationships - Obvious alignment with the original work's temperament and setting - Combines the clarity of an infographic with the premium design of a poster - Unified, exquisite, complete, and suitable for social media sharing or poster display - Avoids a cheap flowchart feel, messy piling, and information overload.