One day, when Don is cleaning the house, he found a mysterious book that didn't belong to him or his brother Katsu. Unfortunately, they are both get pulled into by the book and are sent to the strange world where there are two moons floating in the sky.

When the two wandering around the new world, they get attacked by a large dragon. Luckily, a girl named Maple helps them out and they defeat the dragon.

The two heard from Maple that the large dragon they just encountered is in fact one of those evil beings called 'Noise Devil', and they are attacking many villages in the strange world. Hearing this, Don and Katsu offer to help out Maple, and so their journey to defeat the Noise Devils begins...