I get that it can be a bit difficult, but at least try to use the "Search within this thread" search option. It's not as feasible for some games, which have over 400 pages of posts, but this only has 40. But, here is an answer I wrote to someone else who wanted to know the same thing.Thanks for the help! I already unlocked him. Now what intrigues me is the red dossier, does it have a purpose?
The "Red Dossier" isn't an item you can use. It adds a section to the menu column, in between the Alignment and the endings achieved. It lists all of the girls in the game that you can find and their current status. This is either: unknown, impregnated (seduce), impregnated (rape), or dead. You can also hover over the icon to receive more information. This should all automatically appear once the dossier is bought (if it doesn't, you might need to start a new week). Hope that answers your question.