Summer knows that kouun means good luck" in Japanese, and this year her family has had none. Just when Summer thinks nothing else can possibly go wrong, an emergency whisks her parents away to Japan, right before harvest season leaving Summer and her little brother, Jaz, in the care of their elderly grandparents, Obaachan and Jiichan.
Obaachan and Jiichan are old fashioned, very demanding, and easily disappointed. Between helping Obaachan cook for the workers and with all the other chores, and worrying about her little brother, who can't seem to make any friends, Summer has her hands full. But when a welcome distraction turns into a big mess, causing further disappointment, Summer realises she must try and make her own luck as it might be the only way to save her family.
