The Poltergeist Arc or the Poltergeist Incidents is a story arc that occurs within the Toaru Kagaku Railgun sidestory. It focuses on the series of earthquakes that are happening all around Academy City, which are called Poltergeist. It is the second anime-introduced arc and is part of the Toaru Majutsu no Index canon. The arc reintroduces the Capacity Down, and the closure to Kiyama Harumi's quest to revive her students that was first introduced in the Level Upper Arc.