Angel Core: Tenshi-tachi no Sumika
English title: Angel Core
Japanese title: ANGEL CORE エンゼル・コア～天使たちの住処～
Type: OVA
Source: Visual novel
Episodes: 2
Status: Finished Airing
Aired: Jan 25, 2003 to Apr 25, 2003
Duration: 28 min per ep
Rating: Rx - Hentai
Studios: Shura
Producers: Blue Eyes
Genres: Action, Hentai
Themes: Historical, Mecha, Military

This first entry in the Angel Core series follows a young soldier (fighting for a fictional, futuristic empire) as he's transferred to a secret military installation, where's he surprised to discover that his new job will be having sex with gorgeous young "Angels," a group of genetically unique women who need regular intercourse to nurture their powers.