The Mystery of the Red Portion

Let me take a look at the map.\nWhat are all these colorful markings?\nIt seems like someone intentionally colored this map to prevent people from discovering what's on the map. I'm sure the map is hand-drawn, but it seems a bit too primitive.

I'm really curious about it. The prospect of finding treasures is quite exciting! Haha!\n\nI think I might be able to do something about the red area right here if you bring me a few things.

You're just as curious too, aren't you?\nMy experienced instinct tells me that you're not supposed to erase the red portion, but evaporate it using fire.

Stop getting me so curious!

Did you get everything? Here, let me see!

Here is the Improved Flint.\n\nYou'll see some changes if you open the map and place it over the Improved Flint.\n\nThen come talk to me again. Hurry! I'm dying to know what happens!