Student Nakayama Buichi bets away his allowance at the horse races. After helping Nakayama win once, Moguro offers to help him one more time, as long as he never bets again. Later, after bragging about his win, Nakayama is forced to accept ten million yen from a gangster in a bar to bet at the races. However, before he meets Moguro on the next race day to place the bet, Nakayama gambles all the money and loses.