An Osananajimi who is not only willing to come and wake you up every morning, but is even willing to cosplay in order to make you happy/ get you to wake up? Just marry her already, she's clearly perfect wife material.
Cooking could use some improvement I guess, but otherwise, she's perfect.
Part of me says this was "all according to plan" as Nao knew that Hisashi-kun's mother would be out that day ... unless the two had a certain *cough-cough* conspiracy going on. And she was willing to go (a-hem) "that far" to upgrade their childhood friend relationship, too.
At least her culinary skills needs some more work ... Do Your Best, Nao-chan. As for Hisashi-kun, he'd better "take responsibility, right?"