Try to create ideas for the clans Oda, Takeda, Ashikaga, and Tokugawa to dominate Japan together as allies with marriage ties.
We almost had one with Oda and Ashikaga, but Oda Nobunaga was too harsh on his puppet shogun I guess and got condemned by the 15th Ashikaga Shogun.
Ashikaga Yoshiteru was a very respected man that even Nobunaga played respect to. Perhaps if he lived, Oda Nobunaga might be content with "deputy shogun"
Oda Nobunaga must survive at least 3 years after his real death. Since he was said to be rude, that's going to be difficult since with a rude daimyo, that means the clan either is squished, or they dominate.
POD(s) must be after Battle of Okehazama
Can we do it?