Welcome to my 100% Achievement Guide for Ghost Files (MOAC)!
(Note, When there is no commentary in the video, i had to mute for copyright reasons)
Story related and unmissable.
When you get to the mansion for the first time in chapter 5, a little while into it, a fire will break out which you cannot pass and have to put out.
We then need to find items, which end up being a hose to put said fire out.
Go to 1:32:55 to see where this begins and what items you need
Hope This Helps!