This is the video from a Japanese man who claims he captured footage of a ghost girl wandering through his home. Obviously, there's a simple explanation for all this, and that explanation is this guy caught a ghost girl wandering around his home on video.
He claimed it was a 'zashiki-warashi', a spirit known to bring good luck
It is first seen floating from the left, before crouching down and disappearing. Moments later it reappears on the right side of the light and appears to hover above it, before vanishing completely.
It's kinda cool that spotting a ghost in Japan can mean good luck. Because all the ghosts I've ever encountered have been there to scare and hurt me. I didn't do shit to you, I just live here! Meanwhile they're going to town flicking the bathroom lights on and off to the point where I don't get any sleep and wake up tired and miserable the next day. Ghosts suck and you can tell them I said that unless they're gonna want to come over and moan about it in which case you can tell them they suck and I sleep with a proton pack.
Keep going for the video.
Thanks to OG, who agrees the first thing you should do whenever you spot a ghost is pinch yourself to see if you're dreaming. The second thing is run screaming.