Accelerator, who has returned to the status of being hospitalized, is being examined daily. After getting fed up, Accelerator casually leaves the hospital, and as always gets dragged into another incident... A big battle breaks out over the selfish princess?
When Accelerator sneaks out of the hospital, he runs into a mysterious young woman. Matsuri is stubborn, snobby, and claims to have a common enemy with Accelerator. But even if that’s true, Accelerator has his own problems to deal with–like the strange hallucinations he keeps having!