After the episode
Frog: The Smallest Great Adventure
Ai and Yu, after reading their parent's research and after their parents' disappearance, they decided to go on search for them. They ride a strange train to the Inner World in search of their parents and meets up with Lisa in the train and together they begin their journey within the Inner World. (Source: Anime News Network)
- Action
- Adventure
- Fantasy
- Sci-Fi
