How do I conquer rest of japan as shogun?

[Kvltist]

So I took Kyoto and became shogun, however I only have 21/25 cities to form japan. And now I have a -3 stability hit for declaring war on any japanese nation. Is there any way to form japan witouth taking -3 stability several times?

[tonypa]

You do not have to conquer every Daimyo, you only need 25 provinces, Kyoto and Musashi. Then you can pass Unite Japan! decision and you change to Japan, your daimyos will become independent countries and shogunate government is removed.

(I am not actually sure how many provinces is in Japan area, maybe 25 is all of them...)

Check your Decisions and Policies tab, there should be 2 different decisions to become Japan.

[firestar587]

25 is not all

also they are your vassals now that you are shogun so

[tavald.musashi]

They are your vassals.
Annex 4 pieces of land then form Japan.
Do you have Tokyo+Kyoto?