The Great Part Time Job Plan

It started out as a simple trip to the bank. Noshishi had 300 yen saved up and he wanted to open an account. He even made himself a potato stamp. But Duke Bururu had other plans in store for them. He charged them for reading a magazine, drinking some water, and using tissues while they waited to be served. Now Zorori and the boars have to pay Bururu for using his bank! They refuse to pay and are informed if they don't pay the bill soon, it'll be increased. Just then Youkai-sensei walks into the bank to make a withdrawal. Zorori warns him that the bank will try to rip him off. Youkai-sensei assures Zorori everything is fine but is then informed he has to present 100 Bururu Chocolate bar wrappers to make a withdrawal. Now Youkai-sensei can't repair the monster school. The students agree to help raise money for the chocolate by getting a job. Soon everyone is working at Baku Baku Burger but things aren't going well. Fortunately Zorori has a dandy invention up his sleeve. Based on book 23.