Okay, I am going to be honest: I have no idea what is Yuasa. I remember the old version of her going to the past and stopping the younger self from killing Yurea's grandfather...
That is all I remember. I ALWAYS assumed that this Yuasa was the past Yuasa and she somehow got stuck in the future. Is that not what happened? If not, then what did the MC did that changed the old Master Yuasa into young Yuasa?
Also isn't someone questioning why every house that real estate agent had was cursed? It looks like he rents a house to someone and then kills them in that house and then hides the evidence.
I think that the real estate guy is a killer.
Lastly, I think the MC is going to find out that he died and this is his reality... just my opinion...