兩位英雄背對背站立，背景是烏托邦未來與賽博龐克都市的對比世界，有旗幟和霓虹燈

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Create a cinematic anime key visual for a sci-fi fantasy project titled SHADOW SYNC. Wide 16:9 poster composition, ultra-detailed, split-world contrast: the left half is a brilliant utopian future city in daylight with white crystalline skyscrapers, blue sky, sun flare, greenery, waterways, sleek architecture, and golden energy arcs; the right half is a dark cyberpunk megacity at night with storm clouds, neon blue and purple lights, dense towers, holographic signs, flying structures, and rainlike atmosphere. Center foreground: two back-to-back protagonists standing in profile, separated by the divide between worlds. On the left is a blonde young woman with a low ponytail, slim athletic build, wearing a black sleeveless top and dark short outfit, lit by warm daylight; her face is intentionally covered by a soft square beige blur. On the right is a black-haired young man in futuristic black tactical armor, lit by cool neon blue, with a glowing cyan infinity symbol on his shoulder; his face is intentionally covered by a soft square dark blur. Add exactly 2 large flags or banners: one on the bright left side, purple fabric with gold streaks and a glowing blue circular emblem; one on the dark right side, black fabric with a glowing cyan infinity emblem. Add multiple visible infinity symbols across the cyberpunk side, including one large cyan infinity hologram near the center-right, one on the man's shoulder, one on the right flag, one near the top tower display, and one small sign near the lower-right buildings. Include tower text on the dark side reading "REASON", "AGI", "VALUE", "REASON" stacked vertically. Across the lower center, place the main title in large sharp italic cracked lettering, white on the left blending into electric purple on the right, with energy streaks and shards cutting through it. Beneath the title, add small Japanese subtitle text: 影は、未来を選ぶ. Visual style: high-end anime illustration, dramatic lighting, extreme detail, glossy sci-fi rendering, dynamic particles, petals and glass shards, purple lightning, blue neon bloom, high contrast, poster-quality composition. No extra logos, no watermark, no additional characters.