篠笛: Japanese transverse bamboo flute

俊信: a male given name / 利信: a male given name

忍び入る: sneak into

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

he; boyfriend

technique, art, skill

skill / technique

(judo) yuko, points or the judge call to the points in judo match. Fewer points to ippon.

(historical) a person trained in the art of stealth, acting as a spy, saboteur, and/or assassin