High School DxD EX

Short stories bundled with the first press release of the Blu-Ray/DVD volumes of the High School DxD BorN anime.

The Occult Research Club faces off against invaders known as Underworld Lifeforms led by Loki that have travelled from the future. However, the future also brings a surprise visit by Issei's children.

(Source: highschooldxd.wikia)