I just finished my first read through Lars' route and I've only unlocked the first CG (which I'm guessing you'd get anyway).
Is it *that* necessary to use a guide to unlock CGs? I suppose I missed one trigger somewhere because a few of the final options of the guide didn't show up for me. I didn't expect the VN to be so picky about requirements, so I've been reading without a guide until around day 8 or so.
EDIT: Welp, following the guide skips past Lars' second CG. Any help?