This filename likely refers to a specific entry in a creator's video series or a personal file rather than a famous internet urban legend or creepypasta. Search results indicate several potential connections for the "Obsession" theme:

: A thriller titled Obsession (2025), directed by Curry Barker, follows a couple whose relationship unravels after an encounter with a mysterious force.

There is no widely recognized fictional or non-fictional "full story" for a file specifically named .

: Various YouTube horror channels, such as Let's Read! , produce multi-part series (e.g., "Vol 4") covering "dark family secrets" or "disturbing stories."

: The MrBallen Podcast has an episode titled "The Obsession," part of a "Strange, Dark & Mysterious" series.

Could you share or any visual details from the video?

If you saw this on a platform like TikTok or YouTube, providing the or the channel it was posted on would help in finding the specific plot.