innocent; naive; artless; unsophisticated; pure; fresh
one's first campaign; one's first battle
crowning a boy for the first time at a coming-of-age ceremony
(arch.) crowning a boy for the first time at a coming-of-age ceremony; noh cap with a rolled or drooping tail (indicative of nobility)
for the first time; first thing; doing something for the first time; first menstruation