It says (from right to left)
BUN TOKU BU KOU
BUN => character, word, literature TOKU => virtue, goodness
KOU => achievement
KYUU => penetrate RYUU => dragon
AI => to fit KI=> spirit, energy
BU=> martial, military DO=> path,way
Kokuu is the hanko - it means "void"
Altogether it means the combination of the virtues of literary education with accumulated martial success.
The above part in Gyosho style says - KyuRyu AikiBudo - That's me!!!