The year is 1999. All over the world, excitement grows as the next millennium approaches. For the ordinary Japanese teenager Masa it doesn't mean that much. But very soon he discovers that he was wrong. At the turn of the millennium, ancient prophecies are being fulfilled. The advent of the Messiah is near, and the forces of darkness send their minions to corrupt and enslave the world. They have infiltrated Masa's high school as well. With the help of the exchange student Sophia, who is in fact an angel in human form, Masa must stop the evil...
Angel Halo is a visual novel: the entire game is composed of text and still graphical images, with an occasional choice to make. The choices lead to various CG pictures, as well as different endings. The game contains explicit nudity and sexual scenes.