This is a H.A.T. format Bujin build with a very toxic sideboard. Bujin is a control list with the potential to make explosive OTKs happen. The key piece of the deck is Yamato, which searches for any Bujin monster during the end phase and then discards a Bujin monster. This engine allows you to fill your hand with handtraps (Crane, Mikazuchi), while at the same time stacking your GY with protection (Hare, Turtle) or removal (Quilin).
The extra deck consists of a staple rank 4 toolbox, and the Bujintei monsters. Susanowo is the main component, with a search and the ability to attack all monsters. Kagutshushi is very strong protection, allowing you to save any Bujin beast-warrior monster.
Always remember that this deck, like B.A., discriminates. The Bujin beasts cannot be saved by each other or Kagutsushi, only the beast-warriors can.