A mysterious post on the internet

"The seven deadly sins are not human, but not ghosts, demons or angels, they are just creations made by their creator, but of course they are stronger than a normal man, given that ghosts are now very rare, the real threat is the unknown that leads the group of "The 7 Deadly Sins." they are the real culprits in the daily massacres in Japan, the destruction of Japan, Korea and China, but the worst thing is that out of the 7 billion people on earth, only one billion remain, now the head of the seven sins and with the seven sins himself have plans in Rusia, already everyone has noticed that the Rusian cities that are destroyed go in the shape of a round circle which means that something in the center of Rusia will happen. Now that I've said it all, I hope someone will take this seriously and take action, even the army that wants to attack them, I'd suggest you be careful that you might need sacrifices" Leo reads aloud. 

Roy: It makes sense, but at the same time it doesn't make much sense. 

Mirai: It's kind of weird. 

Henry: Will we have to do something about this? 

Edward: Leo, try to contact the person who made the post. 

Leo: Okay, I guess he'll answer if I write to him in private.

Leo asks her to meet him, and he tells her where they can see each other. 

Leo: I talked to him and he said we would see each other in a place that is close to both of us, Since we're close to Moscow, I told him we'd see each other there. 

Roy: That's great ! 

Edward: When we will meet. 

Leo: He said we should choose when.

Edward: In three days ? 

Henry: It's a good idea. 

Roy: Tell him we'll see each other in 3 days in the center of Moscow. 

Leo: It's done! 

Leo in his mind: I don't really understand how he knows all this, but we'll find out in 3 days. 

Who is the author of that post?