影片描绘了两名拥有日本与韩国血统的女性的人生彼此交错的故事。正在日本大学留学的韩国人智贤（知英 饰），内心深处一直怀抱着难以言说的情感。就在这时，她遇见了与自己截然不同、性格开朗且善于交际的菜菜子（唐田英里佳 饰），两人的心也逐渐靠近。另一方面，一边学习医学、一边思考自己未来的菜菜子，总觉得与母亲之间存在着某种无法填补的距离。就在此时，一个关于她身世的意外事实浮出水面。而这一切，竟始于围绕最尖端生殖医疗发生的一场“过错”。
本片改编自谷村志穗的同名原著小说。

Ayane Sukehira (Kang Ji-Young) is an overweight woman who loves chocolate. Because of her love for chocolate, she has moved to Italy which is famous for its chocolates. There, Ayane Sukehira gets involved in an accident and she passes out. When Ayane Sukehira wakes up, she finds that her appearance has totally changed. She is now a beautiful woman. Ayane Sukehira travels back to Japan and she begins work as an esthetician. She still is not interested in dating and she buries herself in eating chocolate and playing games. One day, popular idol Takumi Minato invites her for dinner