Seikou Tenshi Yarinikuru
聖交天使ヤリニクル
Ichizu Michisada frequently dreams of making a promise with someone that involves the word "agape." One day, a silver-haired, red-eyed angel named Yarinikuru appears before him. She claims to have been sent from heaven to engage in "agape" with him, which she explicitly states refers to having sex.