From the synopsis, it is understood that Hana went to her older sister's Miai/omiai with Takane (wedding arrangement) in place of her older sister. Everyone is in the arrangement meeting is unaware that Hana is the wrong person for this arrangement.
The story is unique, to say the least. Before reading I assumed that Hana would just be a typical shojo MC where she fawns over the guy and its cliche but that couldn't be farther from the truth. In this story, you won't get a ditzy girl who drools over the coldhearted guy and waits for his approval. I wouldn't even say "Hana has the pants in the relationship" because it's an equal balance of teasing back and forth. You get something so much more satisfying and pleasant over the course of what is currently 79 chapters. It takes a slow approach from the start but gradually gets incredibly more enjoyable to the point I can't even wait for new chapters to release.
Each character has an important role in the creation of this story and you will not be dissatisfied with reading this. Once you pass the first 30 chapters everything is just straight bliss.
Takane to Hana is the one example of a RomCom that actually doesn't screw it up. I've never laughed harder at any manga in my life. Hopefully, once this manga is nearing its end I will feel exactly the same because even now I have to hold myself back from rereading every chapter.
