​Discover the scandalous tale of Ryou’s unexpected transfer to Jousei Academy, a twist of fate that holds a dark secret. As Ryou encounters Hagiura Aina, the renowned Japanese history teacher and respected advisor of the gymnastics club, he can’t help but smile. Little does anyone know, Ryou shares a sordid past with Aina’s older sister, Hagiura Yuuna. A hidden transgression that led to Ryou’s transfer. With an ominous grin, Ryou takes advantage of the situation, manipulating Yuuna into fulfilling his desires while forcing Aina to witness the act. The intense emotions take a toll on Aina, arousing a furious and heated desire within her. Experience the thrilling, forbidden pleasure that unfolds in this tantalizing episode.​