From the introduction:
After some time Fighting Angels came to those who had not lost faith, these beautiful, divine creatures, at once male and female. It is said that they offered to sire children to the faithful, without demanding anything else, but many of the faithful asked to help free the planet from tyranny. The Angels accepted this and blessed them with the Holy Phallus, the lance of the Holy Knights. With Divine power coursing through them, the Knights were able to spearhead resistance against the demons, banishing them, purifying them or vanquishing them as they deemed fit, researchers were able to combine what they had learned of lustful magics with the holy phallus to create a spell to gift people with a non divine endowment of their own.
User summary:
The game is distributed as multiple minor files providing supporting materials and ideas. The principle core rules document is noted here.