Lewd Stories of Trinity is an anthology of erotic stories. It is a collection ground for side stories of My Life with Laura, the main game of Society of Lust, or any story that does not fit within it, but plays within the Trinity-verse and offers lore about it.
In order for you to be able to install this game, you need to enable (allow) installation of applications from unknown sources (Unknown sources) in the phone settings. Usually this item is in the Security section