Moriya Daiichi is a man who absolutely hates dentists! After a very traumatic visit as a child, Daiichi has done his best to brush and floss to the extreme so as to avoid going again. While in college, he experiences a shock that has him neglecting his teeth and thus cavities formed. His toothache has Daiichi complaining so much that a friend forces him to finally make an appointment. He is then treated by the one and only Hara-sensei, an extremely young and handsome dentist whose only interest lies in well-kept teeth… And Daiichi's teeth are perfect!