War of Nonexistence Arc

The War of Nonexistence Arc is the sole story arc of Toaru Tamokuteki no Imagine Breaker and a major crossover event between the Kinoverse, Cyverse, the Serasverse, the Mighty Atom Series, and the Sephira Expanded Universe. The story mostly revolves around a Demon known as Gaelion, begining his campaign of returning everything to a state of nonexistence and the many forces plotting to stop him. Among those are the Kamijou Faction, in which its primary figures Unite to save Kamijou Touma, whose body has been posessed and altered by Gaelion.

This arc is also considered to be the culmination of everything that has been built up in the Toaru Michi no Imagine Breaker series since the very beginning, with hints leading to Gaelion's rising as early as the first volumes of Imagine Breaker OT.