What? This is totally ahistorical. The Meiji era (the beginnings of what we might call a modern Japanese state) didn't start until 1868. Before that, Japan was feudal with wars happening all the time. Quoting from Wikipedia about the infamously-chaotic Sengoku period in the 1400s [1], which was just one of
many turbulent times prior to the Meiji period:
> The period saw a breakdown in the traditional master-servant relationship between a lord and his vassals, with many instances of vassals rebelling against their lords, internal dynastic conflict over lordships within noble families (in which vassals would take sides), and the installation of figurehead lords by cadet branches of noble families.[3] The period was also marked by the loosening of samurai culture, with people born into other social strata sometimes making a name for themselves as warriors and thus becoming samurai.
> [W]eariness of war, socioeconomic unrest and poor treatment by aristocrats provoked the wrath of the peasant class. Farmers, craftsmen, merchants and even villages would organize uprisings (known as "ikki") against the ruling class. An extraordinary example is the Kaga Rebellion, in which the local ikki had staged a large-scale revolt with the support of the True Pure Land sect (thereby establishing the term ikkō ikki) and assumed control of the entire province of Kaga.
Whatever post-Heian, pre-Meiji Japan was, it was not an orderly, harmonious society.
[1]: https://en.wikipedia.org/wiki/Sengoku_period