boo-yah!!!
Spoilers (kinda) below:
I couldn't find the pictures 'cause I kept forgetting to input certain numbers into a search for someone's username. I like how the little details that unravel the final mystery were shown at the end; I didn't realise I should've searched for Volume 1 of a certain book, considering we get a glimpse of Volume 2.
Cool mystery! I'll have to check out the Steam version when I get the chance.