Inspired by Cartoon Network's Mao Mao: Heroes of Pure Heart, Kero Kero is a sword wielding hero. A young horned frog raised by tortoises in the unforgiving Desert of Too Hot Heat, Kero dawns the shell of his late master Kame the tortoise, protector of the Key of Hearts melded into the back of his shell. Now bearing the weight of his predecessor on his back, literally, Kero travels the world in search of True Heart, hoping to unlock the mystery of the beloved gem his master so desperately protected. Hoping to find the Heart of Hearts, the last task given to him by his fading master, Kero, wielding a sword carved from the very roots of the Tree of Life itself, carves his way through the perils of the land.