The Blood Moon Chapters: Chapter 1 - Before, During, and After the Stories
Also available as: Android mod
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
Gonna be honest, this one's pretty involved, attempting to delve into the origins of the Dokis and what Project Libitina is (from what's discernible from the original summary).