Minori Kotani, who is working as an office lady after graduating from university, is dating Atsushi, who is in the sales department, in an office romance. However, recently, her boyfriend seems to be obsessed with "big breasts pub" type establishments every night, claiming that it is a business entertainment... Minori, who has more complexes than anyone else about her "flat and small breasts", wants to regain her self-confidence, so one day after work, she attends a slightly suspicious "self-development seminar" in a room in a building in front of the station...!