In a small countryside town, Reiko lives alone, burdened by her dark past. At the convenience store where she works, she develops feelings for a customer who irregularly buys Mont Blanc, referring to him in secret as Mr. Mont Blanc. One day, she finds Mr. Mont Blanc being assaulted by his co-workers and impulsively helps him, sparking a relationship between the two. Mr. Mont Blanc, however, also has a dark past that he cannot tell her.