To add these three mods to your mod folder so they appear in the game, navigate to the \mod folder.

Inside there, open the "list.ini" file.

Edit three lines on the file (the three after the last filled entry) so it reads like;

14 = "MonsterHouse"
15 = "Cecil"
16 = "CecilScylla"

They will then appear in the "Spin-Off Stories" selection area in the game.