After that, take a look at your wiki. There is some more helpful info there.

Fall, Spring, Winter, Summer.

The four seasons lend themselves as a backdrop for the story of the coming of age of the next Lord of Sugura. Starting with the death of his father against the fiery backdrop of the red and yellow leaves of fall, the story spans the years of the young boy’s life to the vengeful heat of his summer when he reclaims his birthright. The characters not only watch, but participate in the youth’s life and his eventual rise to power.

Savage Sengoku