Due to complications with Curseforge's policies the unofficial 1.12 version (official is only up to 1.10 with little news from the creator for months) of Shincolle cannot be put in the the pack directly.
This must be installed manually by the user.

Link for the jar of the unofficial version is on the Shincolle curseforge page: https://www.curseforge.com/minecraft/mc-mods/shincolle
The unoffical version was developed by MystiaLorelei and compiled in a .jar by Cappycot
Orignal made by lulanxd
All credit due goes to these users, please support the mod so that lulan may finish the 1.12 version, doing it this way is all a little bit iffy to be honest but this is a great mod
Direct download link: https://github.com/Cappycot/ShinColle/raw/mc-1.12.2/ShinColle-1.12.2.1.0.jar

Place in the mods folder like normal
For Curseforge/Twitch Pack:
C:\Users\(User name)\Twitch\Minecraft\Instances\Immersive Waifus\mods