Kyūjitai form of 双節棍: nunchucks

self-defence

(weaponry) nunchucks

to study / to learn

to use / to employ / to make use of, to apply / to spend

a knuckle, a joint / melody / point / section

defend

defense, self-defense / protection

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend