well since its a broad statement (non-specific, im assuming aslong as its romance itll be fine?)
have you tried
....
twilight?
jk, i couldnt resist >.>
but for reals its not an anime --- more of a visual novel that im reading through
but it is very vanilla as far as i read through it, its called "fureraba" (i think its on steam?)
other one is "magical marriage lunatics/march"
tho as i have said, they are "visual novels", and aside from fureraba, i dont think magical marriage has SFW content? (being ero scenes)
also, i dont think either of them have anime?, bright side, they are better love stories than twilight