He has to pay for various objects.
First, he is going to take part in a lot of end-year parties.It is estimated that he would spend 20000 YEN on end-year parties.
Second, he has to date with his sweetheart on every Sunday. And he has to buy something for her birthday present. He should have bought one on December 7th. But, the day he gives her a present has been put off because of lack of his money. Furthermore, since Chiristmas is just around the corner, he'll buy Chiristmas present for her.
So, I realized that dating with female needs a lot of money.