Gluttonous Shishimaru eats most of the food in the house with the ninja technique of "gluttony". As expected, Shishimaru has an upset stomach, and Hattori makes him promise to fast for three days. However, Hattori, who is worried about whether Shishimaru will be able to keep his promise, creates a device to monitor Shishimaru.
食いしん坊の獅子丸は、忍法「大食い」で家にあるほとんどの食料を食べてしまう。案の定お腹を壊してしまった獅子丸に、ハットリくんは三日間の絶食を約束させる。しかし獅子丸が約束を守り通せるか心配なハットリくんは、仕掛けを作り獅子丸を監視することにする。
