Saraba, Yoki Hi deals with the taboo topic that has been played for laughs in most harem romcoms, incest. It deals with the subject for what it is and doesn't try to downplay the seriousness of it in the end coming up with punchlines such as "oh but they're not blood-related."

It's not a fluffy romance by any means but it's not downright heart-wrenching but there are times you'd wish the characters laid their feelings bare. You'll cry and you'll be happy with the characters though you have known this all could come down crashing because the foundation of everything lies in a pretend play. The pretentious act of a brother and sibling relationship they kept playing for 15 years yet that's how their relationship began. It's difficult to try and rationalize feelings. It becomes more difficult when you realize how wrong it is to feel that way.

"Is incest so bad? If they don't have any children and if no one knows of their past, would their relationship be acceptable?" I despise the notion of incest, more so when it is played for laughs like you'd see in many writings. Despite that, reading this, all I wanted was for Akira and Kei to find their happiness. A relationship of tears and smiles, of caring and being cared for, was theirs' any different from other people, except the unchangeable fact that they were born under the same roof. As I read further I found myself enjoying it much much more than I had expected.
A story that makes you feel the emotions the characters do and all the more anxious to know what happens after, is what I'd call a good story and this is exactly that.