Only took 21 chapters for actual progress until like some manga where they can go 200+ chapter and only leave off on a kiss scene and timeskip forward X amount of years where they have kids.
I commend the mangaka for actually giving us progress so early without any drama or another guy or girl to threaten their romance. I agree with @Whiterunight I think all romance manga should be this way because this manga was the personification of perfect vanilla romance