This story concept is a mixture between the urban legend of Polybius and the movie Ring. That being said, it isn't very good.
The art style is gorgeous, but the story was flat and should've been more fleshed out. I think if it had been longer, perhaps i would've somewhat enjoyed it.
They tried to make me sympathize with Takashi in the end (perhaps similar to how some sympathize with Sadako), but it just wasn't working for me. Not to mention the ending itself. A typical horror twist that makes you question why they'd add that in when it's a one-shot, but you'll never get the answer (because it's a oneshot).
Hopefully this author has other works that I'll enjoy more because the art style is genuinely amazing.
Portus