The Great Ninja Plan

Zorori, Ishishi, and Noshishi have enrolled in Gorimaru and Sarumaru's ninja school. The classes are free, but it looks like the class supplies aren't. The ninja clothes cost 30,000 yen, the wrapping cloth 15,000 yen and the straws cost 5,000 yen! It's a good thing their Bururu card will be worth 100,000,000 yen because they're going to need it to pay back their debt. But what will Zorori do when Gorimaru accidentally rips their card in two? Why steal Michael's now 100,000,000 yen Bururu card of course! Based on book 18.