Reiko Kuki (Mayu Matsuoka) is single and 27-years-old. She works in the accounting department for a mid-size toy manufacturer. Because of an incident from her past, she lives her life frugally and she hardly buys stuff that is not a necessity. She even has a specific day to shop. A year ago, she found small dishes at a secondhand store and liked them immediately. For the past year, she has visited the store and thought carefully on whether to buy the dishes. Finally, she makes the decision to make the purchase for 1680 yen ($15). She enters the secondhand store with great expectation, but she sees a man and woman buying small dishes at random. The man is Keita Saruwatari (Haruma Miura). His father runs the toy company where Reiko Kuki works.
A few days later, Keita Saruwatari goes to the accounting department at the toy company. His father got angry at his wastefulness and sent him to the accounting department to learn the value of money. Reiko Kuki happens to be the person to advise Keita Saruwatari about money.