Keep is a boy with no memory of his past and of unknown origin. He does, however, posess an ancient magical artefact called the “Spin Shell”, granting him the ability to tame wild beasts - legendary creatures hidden throughout the world - acquire their power and even fuse with them! The young Jay, Alice, Mac and Toto accompany Keep in a great adventure in search of his hidden past, gradually unraveling a mystery rooted in the distant past, an age where the brave Keepers saved the world from the invasion of the Underground Creatures. Over the course of their adventures, the five young heroes acquire new Spin Shells and also learn of the Reapers - obsure figures plotting world domination from the shadows, while devising ways to use the power of the Beasts to their advantage...
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