The 4 Steps

Markus Step's parents decide to give him a video camera to give him a hobby. So he starts to make a vlog on his daily life. Unfortunately, there seems to be something wrong with his camera due to the strange footage he finds on it. But then even more strange things happen when he finds childhood objects that he doesn't remember...

One of the first Slender Man Mythos series to take place in Britain.

Here's the YouTube channel, the Twitter feed, and the character Kyle's blog.

There is also a helpful Unfiction thread if you need it.

This story provides examples of:

 * The Blank: You know who...
 * Genre Savvy: Kyle is well aware of The Slender Man Mythos when Markus tells him about his predicament.
 * Humanoid Abomination: Guess...
 * Sanity Slippage: Might be happening to
 * Shout-Out: Kyle shows Markus Marble Hornets after Markus tells him what's happening to him.
 * Slender Man Mythos