The story takes place in a world with 3 kingdoms, the Red, White, and Blue Kingdom. In this world, they have highly-advanced dolls with some closely resembling humans. These dolls occasionally need maintenance which is done by a “tuner”.
A young playwright named Wakaba writes a controversial play about a traitor named Ein who killed a ruler of the White Kingdom, Christina. In Wakaba’s play, she presumes that Ein did not betray Christina, but was actually her loyal supporter.