Satomi Mizuse has always had bad luck with men. A two-timing man, a DV man, a married man, a stalker .......
For 27 years, Satomi thought she was just being serious. For 27 years, Satomi thought she was just being serious about her life, even about her love life, and she always tried to be sincere in her own way in dealing with her partners.
Despite this, she found herself in a terrible situation. One day, Satomi misses the nearest train on her way to work, and for the first time in her life, she has to take a day off on the sly. This choice leads to an encounter with a man, which changes Satomi's destiny.