Tokyo Lockdown

Tokyo Lockdown in Shin Megami Tensei: Devil Survivor refers to a barricade within the metropolis of Tokyo.

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The Tokyo Lockdown barricade was built around the Yamanote Line, which coincidentally runs around a circle in the area of urban Tokyo. The military built the barricade overnight to prevent people from entering the area, claiming that poisonous gas has flooded the area from beneath ground. As a result, many people are trapped within the barricade, including the protagonist and his friends Yuzu Tanikawa and Atsuro Kihara.