one day

(rare) the first day of the month

spend, pass (time); have (a holiday) / do something too much, carry something too far

expresses approval, appreciation, or happiness

lucky

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

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

(manga, fandom slang) event where a young male protagonist accidentally makes intimate contact with a girl or catches an eyeful

all day

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