Minori Kotani, who is an office lady when she joins a new graduate, had an in-house romance with Atsushi, who belongs to the sales department. However, recently, the boyfriend seems to be obsessed with a "big boobs pub" shop like every night, saying that it is entertainment for work. Minori, who had more complex than anyone else in her "pettanko small breasts", wanted to regain her confidence, and after work one day, in a room in the building in front of the station, a slightly dubious "self" I participated in the "Enlightenment Seminar" ...!