在这部旅馆之嫁片中,她的名字叫做夏美（比嘉愛未飾演），個性開朗樂觀，喜歡與人互動。夏美的家中在橫濱經營法式甜點，雖然店面不大，但她覺得全家人團結一心，共同追求夢想，是人生最幸福的事。夏美和男友柾樹（內田朝陽飾演）已論及婚嫁，人生看似一切順遂。但是有一天，男友卻突然提出分手，要回老家繼承旅館「加賀美屋」。
位於盛岡的「加賀美屋」，是一間歷史悠久的名旅館，代代由老闆娘守護至今。大老闆娘香津乃是柾樹的奶奶，將柾樹一手帶大。如今大老闆娘卻病倒了，並希望柾樹回來繼承家業。
於是夏美帶著莫大的決心，毅然決然來到未婚夫的老家：「加賀美屋」，從零開始學習當老闆娘。夏美從最基本的工作開始，擦鞋、鋪床、端盤、提行李…，雖然遠比想像中辛苦，她也認真修行絕不認輸。
在加賀美屋這個大家庭中，夏美深得大老闆娘的喜愛，卻也因此受到其他人排擠。雖然旅館之路漫長而艱辛，堅強的夏美仍積極面對所有考驗。從甜點師傅到旅館之嫁，夏美能成為人人崇敬的老板娘嗎？
Natsumi is the 23 years old daughter of a master baker in Yokohama and in training with her father to become a pastry chef. She lives with her parents and younger brother in Yokohama. One day she travels to Iwate Prefecture with her boyfriend Masaki for his grandmother Katsuno's 77th birthday. While they are there, Katsuno, head okami of a famous ryokan in Morioka City, becomes ill and asks Masaki to return to run the ryokan. Natsumi returns to Yokohama and later Masaki visits, asking her to disregard their earlier plans to get married because he will return to Morioka as requested by Katsuno. However, Natsumi surprises him with a vow to become the ryokan's okami. Is Natsumi in for clear skies as suggested by the series name?
