Honoka, known as the "Swan" for her supple silk-like body, had once drawn global attention. However, due to her sister's heart illness requiring constant care, she could no longer secure enough practice time, causing her performance to decline and pushing her away from the spotlight. Desperate, she becomes tempted by an underground ballet offer that promises to cover her sister's medical expenses, but hesitates upon learning the performances center around sexual themes. Yet her innate erotic talent, rapidly growing potential, and her anus refined through rigorous training ultimately lead her to a new realm. Here, the Swan rises—dancing wildly, uncontrollably, beautifully.