Kamisama Hajimemashita: Kako-hen

神様はじめました ～過去編～

Four OVA episodes bundled with the 22nd, 23rd, 24th, and 25th volumes of the manga.

The OAD project will adapt the "past arc," which spans from mid-volume 14 to volume 17 in the manga.

(Source: AniList.co)