Wakaba Mano (Mimura) and her husband Toru (Kuranosuke Sasaki) recently bought a house and moved to the Tokyo suburbs. Wakaba had a tough time because of her freespirited son Takeru (Shinon Hirano) who made her isolated from other gossiping mothers in his former kindergarten. In this new town, Wakaba is so determined to blend in with the others.

One day, Wakaba met Saitou-san (Alisa Mizuki) a 30-year-old housewife. Since her husband is always abroad for business, she is responsible for protecting her only son Junichi’s future. Junichi goes to the same kindergarten as Takeru, where other parents all seem to avoid SAITOU san because she is too straightforward. For Saitou-san, what is wrong is wrong. She is never afraid of confronting bad mannered people. The righteous, dignified lone mother Saitou-san’s way of life gradually influences Wakaba and the other people in town.

观月亚里沙所饰演的齐藤太太最讨厌的就是不遵守规矩的家伙。已是1岁孩子的母亲的她一向是有话直说，也曾让消极的妈妈们对她敬而远之。

行走中抽烟，耳机的声音太大吵到别人也丝毫不敢到愧疚的年轻人, 在电车上不分场合胡闹的小孩子, 还有对此视而不见的大人... 不文明的事很容易会看见也装没看见。齐藤太太就是敢对这样的现实叫暂停，成为了「敢说NO的日本人」，为了一针见血的指出社会的不平之事而四处奔走.