"Thank you!" You said to the customer who had left.

You are a cashier working in a store. This midnight, you saw a man. He pick up a pack of cigarettes, looking for his money. When he took out the money, you accidentally touched his hand, he raised his head and looked at you. When you thought he was going to yell, he stared at you blankly. He gave you the money, picked up the cigarettes and left quickly.

After this, he comes to the store every midnight.

"400 yen, right?" He whispered.