I have a very boring experience from reading Portus.

As mentioned in another review, the story seems overly complex because the author mixed too many themes and plots together. I think the narrative appears elaborated but it's actually a very simplistic story. In other words : it's artificially complex. Some events are completely forced to try to shock the reader but oh dear it's not shocking at all, when it happens you just wonder why suddenly the characters act like that.

Drawings are bad. Very bad. If you have a few notions of drawing, or at least used to look at good art, you'll see that anatomy is never accurate. perspective is lacking. Even the shots that are supposed to be scary, you laugh at it (in a bad way). Typical example, the author tried to draw "realistic" close ups of the faces when characters are supposed to be scared, or horrified by something... But it's a total fail and they just look like Memes trolls' faces...

Speaking of the characters, most of 'em aren't introduced properly. They're all very flat and artificial. I haven't got any empathy for any of them.

So Overall, and about the enjoyment, well, this is all going very low. I think, if you never heard of "The ring" and that is your first horror story ever, it might be a decent (like 5/10) manga to start with. But otherwise, really, I don't recommend it, it's pathetic. If you're a horror fan, you'll be disappointed.