The twilight came on.
Usu kure ga sematta.
light (e.g. colour, color)
sunset; sundown; nightfall; dusk; end; close; year-end; end of the year
indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and
to approach; to draw near; to be imminent; to press (someone for something); to urge; to compel