Bloodborne's story is um... kinda non-existent unless you go searching for it.
That search tends to involve reading item descriptions, reading into the game's architecture, its environments. Can't be bothered doing that? Watch this 11 minute video instead.
It's full of details I hadn't noticed, mainly because I was too busy trying to not die against the Shadows of Yarnham for the 50th time in a row.
Australian VaatiVidya is behind it. He's done a longer, more indulgent version of this video before, but this is a far more concise attempt at unraveling the secrets of Bloodborne. His previous attempt was 30 minutes long. Ain't nobody got time for that!