Hiroko attends school to become a dental hygienist while working as an assistant at a dental clinic. At the clinic where she works, the director's son, Takashi, didn't work and was just meditating. One day during the lunch break when the clinic is crowded, you come to the consultation room to have your teeth cleaned, but the doctor is busy before the conference, so Hiroko has no choice but to undertake it as a practice... Since then, Takashi has done his best to humiliate Hiroko on the pretext of cleaning.
