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Mutated homo sapiens that have a dangerous telekinetic power is being captured and isolated in laboratories by the government. One of the sixth-sense-possessing humanoids escapes loses her memories and winds up living with a boy from her past.

Isei finds new troubles about to enter into his life and two even sleeping in his bed. While looking at an old photo album of Isei's, Kiba sees a familiar sword being held by an old friend of Isei's, which reopen's old wounds.

The third season of High School DxD based on the light novel series by Ichiei Ishibumi. It's following Volumes 5 till 7 in a rearranged order by Ishibumi-sensei himself.

In August of 20XX, a portal to a parallel world, known as the "Gate," suddenly appeared in Ginza, Tokyo. Monsters and troops poured out of the portal, turning the shopping district into a bloody inferno.