I think Banzai goes like this:
Rnd 1 - 1, 2, 3, 4, 5, 6
Rnd 2 - 6, 5, 4, 3, 2, 1
Rnd 3 - 6, 5, 4, 3, 2, 1
Rnd 4 - 1, 2, 3, 4, 5, 6
Rnd 5 - 6, 5, 4, 3, 2, 1
Rnd 6 - 1, 2, 3, 4, 5, 6
so, after 6 rounds each will have a comparative equal overall draft position. In this example, all add up to 21. Banzai is used often to equalise the effect of a draft where a captain's score is used.
NB. Apologies to Rowsus if I'm wrong.