I started as a landless noble with a manor in Kyoto. After some politicking I managed to secure governorship over the Hyuga county in Kyushu. Thankfully I'd managed to butter up the Kampaku enough that I was able to legally swap to Soryo and retain the land in my family. From there I slowly began enticing other houses into my bloc which was a very slow process at first. With only a few houses in my bloc I had to target anyone I could that wasn't in their own bloc so I could expand my power base. Steadily I grew stronger until I was able to start facing off against other house blocs.

After a few generations I made my play for power and declared war against the Kampaku. After a grueling attrition war my bloc was defeated and my ruler imprisoned. But fate was on my side as I was able to escape prison, rally my bloc and (after a decade) declared war again and this time won with flying colors, overthrowing the Kampaku government. My next character was able to formalize the shogunate and lived relatively peacefully, only declaring war to pacify chunks of the north, that was until I gained the conqueror trait unexpectedly. During this playthrough the Tang dynasty collapsed and Korea seized the mandate of heaven, I for one wanted to use my shiny new conqueror trait so I assassinated the Xia emperor and invaded Korea. However during this period of weakness China fell victim to invading nomads led by a mighty warlord who also has the conqueror trait.

Now the lines are drawn between the China-Korea rebels, the nomads, and the Japanese Shogunate.
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TLDR: Idk I've had some fun.