Doki Doki The Blue Seas: Nightmare of the Yandere Doki
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 Blue Seas special mini-mod Nightmare of the Yandere Doki. Why have your friends and girlfriend entirely gone off the rails? Will main character be able to survive Halloween, or will he die?
Full credits
dewallt101, Leviathan Slayer, The Graceful, Prox, Tune Eternal, BlackRabbitArtworks