I don't know who among the Manga Bookshelf crew wrote that this was a whole volume of payoff (because I read them via LJ feed unless I want to comment), but that's exactly what it is - the culmination of the developing love among insecurity and miscommunication (from both sides) of Sawako and Shota.
And because this series at its core is the developing of the shy duckling Sawako into a courageous swan, appreciated by everyone, not just Kazehaya, we have some very moving confessions from her side, even without being totally sure that Kazehaya shares her feeling.
But when he does ^^, well...
Okay, the setting of this climax of the last ten volumes amid the class at the cultural festival at school may have been over the top for a real life love story, but it has the great advantage to bring in the tension of two people wanting to concentrate on each other amidst all the claims on their time and therefore nervousness that is even real life inherent in a declaration of love ("Joe" is all I need to mention, I'm sure).
Because Shiina has carefully developed both lovers, Kazehaya is actually conscious that his habit of keeping his deepest feelings to himself - away from everyone, even Ryu - will NOT work when facing Sawako and her unfamiliarity with the average teenage behaviourisms. She won't be able to believe, because she has seen herself as so unworthy for so long, so he has to make it totally obvious (we do get the day after here, too - and all the people at school who can't believe the truth or think Sawako might have misled Kazehaya) - so he actually becomes poetic, and open even with with the whole school watching (and gets the mickey taken out of that scene the next day in front of the whole class, of course... this is a school with teenagers...).
He heroically bears up under this, because he knows how fragile the understanding is until Sawako is sure enough of her own worth to be somewhat confident that she is being loved by him(papering her room and the bath with stickers how the confession hasn't been a dream is one way she deals with this herself).
We also get Kurumi dealing with both being together, which I particularly like. This is just the start of being together with your loved one - the first steps haven't even be taken yet. There is a reason why this manga still goes on, because this is as realistic a teenage love as highly idealised shoujo will offer.
As Kazehaja says in his internal monologue at the most important spread in the volume - his feelings have finally reached Sawako. Reaching you - was his aim. That's the title a scanlation team used to translate Kimi ni Todoke with, and I expect that's the meaning the mangaka actually wanted to convey in the title.