Former buddy Fate Four has foretold the visit of the former owner, Princess Lionor. Dust who senses danger tries to leave the accelerator, but when he notices it, Lean and the princess are replaced !? "It's been a long time, Line Shaker. I decided to live as an adventurer for a while, so thank you!" Dust swayed by a princess who is too free-spirited as before. On the other hand, Lean, who was caught in the castle as a substitute for Lionor, finally learned about the past of dust.