The alternate-world story begins with the journey of the would-be hero DX to save Marion, who has sealed a fire dragon threatening the land. DX is the heir of the lord of the town Ekariipu, and he is also potentially in the line of succession for the royal throne. He encounters Marion, a girl who dwells in the mighty tree that protects Ekariipu, and falls in love with her. However, if Marion's soul gets close to a human, that would resurrect the fire dragon she has sealed away. DX embarks on an adventure to learn the secrets to freeing Marion and vanquishing the dragon.

[Source: Anime News Network]