13 year old Anne Boonchuy finds a treasure chest that sends her to Amphibia, a land of toads and large insects. Anne needs Sprig's help to survive.
In a land populated by anthropomorphic frogs and peculiar creatures, a terrifying beast is coming, but the 'beast' turns out to be a human child, Anne. Sprig tries to catch her to prove he can take responsibility, but they become friends and he tries to help her with her homesickness.