The password is ルコルモンのだいじsomeone have password for treasure chest in dream world ?
Yeah, it doesn't help that much. If you don't want to find out the right ideograms on your own, let's play battleship.
I count from the left top, unless I say otherwise in the instructions.
Press X to erase the letters already written
-Last line, 2nd column from the right. (it may need 2 clicks because you have to change the symbols you see)
-Last line, 3rd column.
-2nd line, 5th column.
-Last line, 3rd column.
-3rd line from the bottom, 5th column.
-2nd line from the bottom, 5th column.
-Last line, 2nd column from the right twice. (it may need 3 clicks because you have to change the symbols you see twice)
-5th line, 5th column.
-3rd line, 6th column.
-1st line, 2nd column.
-2nd line, 4th column from the right.
-Last line, last column.