A sequel to "Dark Green," which depicts the success of hero Luon, who continues to fight the unidentified nightmare Zel that attacks in the dream world "R-Dream." Several decades have passed since the turmoil of the previous work, and the number of people who remember "R-Dream" has decreased. Mai-chan, a high school girl who lives a normal life, meets a boy who got lost in her dream. She often sees the boy in her dreams after that, but the dreams she has had since she met the boy are all nightmares chased by something ... The boy Mai met was the hero Luon of "R-Dream" who lost her memory and power.