Portus is essentially one of those "cursed video game" creepypastas but in a manga format. At least, it starts like that. But explaining the story would be no good. Suffice to say it was quite enjoyable, with good pacing, and better than what I initially expected. Art-wise, the scenarios are detailed and eerie, with a cinematic quality to them. The... let's call them ghost photography parts of the illustrations... are disturbing but in a nostalgic way for horror enthusiasts. They're the kinda found footage editions you see online for SCP objects but because this is all in an almost realistic manga style, they sell the ideathat "this is not supposed to be there" so much better. Character's disturbed expressions also hit very well.
It's one of those books you forget why you got it and then one day devour in less than an hour.