This is the O express that runs in K Prefecture, which is a little far from central Tokyo.Every morning during the rush hour, the congestion rate exceeded 150%, and the number of victims of dementia increased.Azumi decided to use the route for commuting.The act of riding in a "female-only vehicle" so as not to be a victim of dementia even a little dyes Azumi's commute time into a lily color.One day, Azumi, who should have gotten on the women-only train car as usual, ends up being molested.Out of fear, she talks about it to her boss, Yui.