Thanks Tweeg, based on your confirmation, I double-checked with my contact, and he also confirmed it to me. Here's what he said.
OK,this item is official item.
And recorded in 3.5inch floppy disk,but the format is for PC-9801 series.
PC-9801 series was used in mainly Japan
I asked him to buy it for me, so we'll see what it is, as I'll take a picture as always upon receival.
And while I'm at it, I might ask him to buy the weird pirated PSIV PC game we talked on another topic. I know it's a cheap pirate product, but I'm really curious, and it's only 1000 yen
tilinelson2, after I'm done with this transaction
I'll ask him if he's interrested in doing business with other peoples, and with people from brazil in particular