Daisonishiki (aka Daishogun) is a variegated bean leaf variety bred using Tamakongo in its background. Like Tamakongo, it usually gets the stout, short flowers that is typical of many bean leaf varieties.
Occasionally though, an error in the floral meristem occurs and the last flower of the spike will develop in a strange way that involves the production of numerous floral bracts that have partially taken on the appearance of tepals, usually terminating with a small and deformed flower.
Often times this is called a Danzaki 段咲き flower, but the development is quite different from other varieties that are better known for Danzaki flowers such as Shunkyuden. In those cases, the column is mutated to form extra petals, but in this case, the mutation happens prior to the formation of the bud itself, and the column of the terminating flower, while reduced, is still present.
Just another one of the interesting quirks that some Neo varieties can have.