When Mum leaves her cigarettes at home her step-daughter Misaki spots them and calls her pal Pia who comes over to take advantage of a chance for some fun chain smoking Mum's cigarettes. They have a grand time -- Pia watches Misaki smoke and imitates her, making progress in becoming a heavy smoker like her friend. Later Pia boldly offers 2 cigarettes to Misaki and they each smoke doubles, playfully pretending that it's nothing unusual.