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
After a late night of reading and the background noise of the News you soon find out that tomorrow night, a clear and beautiful sky will show itself with the stars glowing like they never have, and with Yuri by your side, it'll be even better.