OCCULT & DEMONIC as hell, with some very intense and scary scenes in there the way it was made back then is awesome! not for the weakhearted 12,16+, and both main chara. have an spititual guideline to duty! EXTERMINATION of devils!
Tokyo Revelations shares a few similarities to X/1999. Both are epic battles for the world, though they have different causes, they involve childhood friends taking opposing sides in the battle for what they believe is right. They also both have slight shonen-ai themes.