Touka Gettan is set in the land of Kamitsumihara, where traces of magic and legend can still be seen. The land has been under the protection of the Kamiazuma clan since it was founded. The story revolves around Touka Kamiazuma, the main protagonist, who has lost all his memory, and his body has stopped growing. It sounds like he is in misery, but he somehow enjoys his life with his mother. One day, he joins a high school located nearby, believing it will bring back his memory....