Seiko Tenshi Yarinikuru

When you turn 16, let's have "agape" together... Michisada Ichizu, a young man who often dreams of making such a promise with a woman; one day, a silver-haired, red-eyed, "unshod" angel named Yarinikuru suddenly appears. According to her, she was sent from heaven to have "agape" (sex) with Ichizu!?...