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
Similar to the base game, Sayori convinces MC to join the Literature Club. Route-based. In each route, MC falls in love with one of the club members, and discovers issues that they have. Good and bad ending, with a bonus chapter included.