Angel's Feather is a boy's love (yaoi) game. There are many other sites out there explaining this genre. If you need more information on it, just google it. In short, if the thought of boys kissing disturbs you, I suggest you find another website to browse.

Below is the cover art for the game.

One of the things that makes it rather unique is that you are not limited to one main character to make your matches with. Each of the 6 main characters can be paired with any of the others. (Some have reverable seme/uke scenarios.) The game has also spawned several drama CD's, a novel, a sequel, and some creator-approval serialized stories and doujinshi.

If you are unfamiliar with the game, the background page is a good place to start.

This site currently deals only with the first game, however there is a single info page on the second game, Kohaku no Hitomi/Kuro no Zanei.