34-year-old Miyuki is a traditional Japanese housewife, with her "salaryman" husband and a son. Although she believes her dream has come true, she secretly feels unsatisfied with the fact her life completely depends on her husband. Sumiko, Miyuki's childhood friend, is a single woman who has recently been promoted to a manager at a huge corporation.With her high salary, she doesn't rely on anybody, but she hasn't been romantically involved for some time, and begins to feel anxious about living life alone. Yu is just about to turn thirty, but still depends on her father and lives at his home as a "parasite single." She cannot figure out what she really wants to do or what she really wants to be. One day, Miyuki meets an old lady whom she is nursing as her part-time job. Just before passing away, the lady signs over the deed to a beach house to Miyuki. The old lady turns out to be Yu's grandmother. Initially, Miyuki has no idea what she should do with the beach house, but after being encouraged by Sumiko, whom she reunites with after twenty years, Miyuki finally decides to run it as a business. Sumiko and Yu also join as business partners, but each of them has a totally different idea for the house and the situation between them increasingly worsens. Will the beach house succeed? Will the three women release their anxieties and start new lives?

34岁的美由纪作为专业主妇，守护着家庭，有老实稳重的上班族丈夫和儿子，牢牢抓住了传统式「幸福女性」的典型的贤妻良母型女性。虽然最近致力于刚开始的访问护理的工作，但心中抱有不能自立的自卑感和不安。美由纪幼小时的好朋友寿美子是刚刚升任为一流建筑公司课长的能干的自立型女性。虽然过着收入高不依赖男子的独立自主的生活，但不懂得怎么恋爱，对迟早会到来的孤独感而感到不安。还有快到30岁的优，是不管做任何事情都不踏实的单身寄生族。毫无目标，日暮途穷。每天过着厌恶自己的日子。

夏天即将来临之际一位老太太留给美由纪「海之家」的经营权后去世。而那位老太太就是优的祖母。卷入一场意想不到的纷争，20年后再次与寿美子相逢的美由纪，被寿美子的强力推荐下决定经营「海之家」。寿美子和优也参与经营，可是因三人的意见和理想不同，而导致三人的关系一塌糊涂。究竟三个人能够顺利经营「海之家」吗？还有各个的烦恼、苦恼能够解决，踏上新的人生道路呢？这部剧描写了三个现代女性的不同的生活方式。