Secret Competition of Lewd Rhythmic Gymnastics and Sister’s Rescue

Haneoka Fubuki searches for his missing sister-in-law, Haneoka Miku, and discovers her at Tomomi’s house, her classmate. Tomomi reveals Miku is ensnared in the perilous world of dark rhythmic gymnastics, a secret and lewd competition. Determined to save her, Fubuki decides to become a coach in this shadowy sport. He approaches Fujimiya Koyuki, chosen by Tomomi, unaware of the challenges that await him. Together, they navigate the dark and sensual realm to rescue Miku.