Doki Doki Cheating Club
Most mods install on top of a fresh copy of DDLC, free from ddlc.moe. Follow the author's instructions, and keep a clean copy of the game.
About this mod
A mod where you have all the girls as your girlfriends, but they don't know about each other, and your mission is to cheat on them all without getting caught.
Full credits
Author DevAV, Coauthor DevAV, Coder DevAV, Story Created by DevAV :)