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

one day

one, 1 / the first in order, foremost / the beginning / the best / a kind of; one of something / (card games) an ace / unity / the bottom string of a shamisen or other Japanese musical instrument

note / annotation / comment

each person

Alternative form of 一々

猛速: seriously fast speed

one day, 24 hours / the daytime, the period from dawn until dusk / (figuratively) a short period of time / one day, someday, an unspecified day / the first day of the month

once again, once more

(rare) the first day of the month