~ Nebula is the eighth novel in a parallel world series that was published at the same time as Selena's novel, in May 2020. This novel tells the story of Miss Selena's life while at the High Level Shadow Academy (ABTT). Selena is not alone, in this novel there will be Mata and Tazk who take part in Selena's story.

Then, in this novel, Selena must look for clues and visit various locations to find all the answers to the missions given by the evil creatures that often threaten her.

Until Selena ventured into the Nebula clan in search of the Eternal Grail ordered by Tamus, an evil creature who often threatens Selena. In the novel Nebula will also be revealed about the mystery of who the real parents of Raib are.

Not only that, in this novel the friendship of the three of them, namely Selena, Tazk, and Mata will be tested.

So, how is the story between their friendship? What really happened? How does Selena solve the riddle of the Eternal Grail? Then, how was life in the Nebula clan and what was so special about this clan?