Fubuki Haneoka continues his search for his missing sister Miku, tracing her steps to the home of her classmate Tomomi. There he learns of a concealed competition called dark rhythmic gymnastics, where entrants refine their grace through demanding routines. Determined to pull Miku free from its hidden side, he steels himself to step in as a coach. His path soon brings him alongside Fujimiya Koyuki, a newcomer selected by Tomomi whose future remains uncertain.