It has long been known that Master Foxtail, keeper of the Mathom House, may not actually have the most fascinating, or even genuine, Mathoms available ("Of course the Bullroarer's Club is genuine! It's in such good condition because I have had to replace the handle twice, and the main body three times!"), and that he is often suspicious, or maybe envious, of the activities of folk in the Grand Order. Well, perhaps he realises something needs to change. For something is afoot at the Mathom house! It appears that Master Foxtail has got himself a pet turtle.... Where? Right there! On the stairs! What does it mean? Is it a guard turtle, guarding an actual Mathom of some worth? Or is Master Foxtail planning on opening some sort of pet emporium, passing off small creatures as Mathoms instead?