I SWEAR I've seen or heard about this story before (or a variation of it), but I just can't place it.
It wasn't (fake?) brother/sister relationship, but after hearing it was about 100 night visits, I KNEW he would fail in the end. Nice to see her having a 'relatively' good end in this story though, as if my memory hasn't failed me, the version I know of has her shunned BECAUSE she 'caused' mr. suitor's death. THAT didn't sit well in the social circles of the time, so despite her unparalleled legendary beauty, even no rank men want to do nothing with her because of her mean attitude.
But yeah, couldn't they have 'rewritten' history just this once by having Komachi end up with the suitor? Stupid Mr. Suitor, should've just allowed her to work in the palace as well....