Japanese storytelling is characteristic to be downtempo. There are no big plot twists on it. Instead, they focus on concrete feelings or fears and they develop them. This series is not the exception. But the way in which it is told and how the story grows with the main character, Wako, is really engaging.
Wako is a woman on her thirties that is concerned about marriage, having a child and having a job. She's in a solid ground but that doesn't make her happy. She wants to turn around her life but she fears to lose all and never get to that situation again. That's because she's getting older and, in the context of the Japanese society, it's every time more difficult to fulfil those goals from scratch. When she feels surpassed, founds a way to escape from that difficult reality, which to society's standard point of view can result disgusting.
In fact, these ignominious situations are really well portraited on the series, being sometimes difficult to keep watching since you are observing the moral decadence of a woman, but in the other hand, it's overwhelming to see her neverending pursuit of happiness.