Found a picture of a captured Tsurugi just after the end of the war in wiki, propeller removed.
As you can see in the pic, it looked pristine, sporting top wing and fuselage Hinomarus surrounded by green paint, as to assist (I believe) the field personnel to apply the rest green paint (hastilly supposedly), without affecting the Hinomarus.
I had not seen a lot of Tsurugis modeled with this type of Hinomarus and, since
Eduard surprisingly provided those, I chose to decal my Tsurugi like this.
It will be presented as it was before the end of the war, having just emerged out of Nakajima's production line, test flight having completed, resting in Nakajima factory hangar, awaiting to be sent to a Kamikaze squadron, (a thing that would never happen). It will look almost pristine, maybe a very very light engine stain (if at all)
So: masking removed and Future applied to protect the finish (though Humbrol 11 isn't that sensitive).
Decals applied and worked beautifully, though they were more than 15 years old.
Mr Mark Softer takes care of them now (in multiple applications, since they react subtly).
P.S. @airbum, as you can see I did my homework and managed to insert the pics in the text. Looks more alive now. Thanks for the inspiration, my friend.
All the best!