I have a buddy (Gary) that had one of these “National flags” with signatures and well wishes that were given to the soldier when leaving for war.
He also has a rifle and pistol, all from the same soldier.
These were all given to Gary by his father and he was the one that did the “deed” if you will to get them.
About 15 years ago Gary was invited by the government of Japan to give a speech to a very large group. Gary figured that maybe some government people might be able to find a member of this soldiers family. When Gary brought up the subject they said “we will find this family”
I don’t recall now the whole story but for the family to have back that flag was the highest honor that could be given to them.
He said he met with 5 or 6 of the family members and when he handed it over to them he said it was as if that soldier had just died that day, Gary was amazed at the out pouring of emotions just to get that flag back.
He said he will never forget that meeting for the rest of his life.
This does not give you any more of a clue as to what it says but its “a story that is connected” in some way at least.