DKB formed DKB Group ( also known as Dai - ichi Kangyo Group ) and became the central bank of DKB Group .
DKB Group ( also known as Dai - ichi Kangyo Group ) is the largest Japanese keiretsu in terms of the number of associated companies .
DKB formed DKB Group ( also known as Dai - ichi Kangyo Group ) , the largest Japanese keiretsu in terms of the number of associated companies , and became the central bank of DKB Group .