Yuuki, who works at a design office, had gradually formed a deep bond with Mako, her former vocational school instructor. The origins of their relationship were entangled with complex emotions. Yuuki, who once had no interest in lesbian relationships, began to feel confusion over her own hidden feelings for women. From one strange night onward, she started having mysterious dreams. In these dreams, she becomes a female prisoner, locked in a cell with Mako, enduring various torments and tortures, yet the two affirm their feelings for each other through the pain. Could this dream be foreshadowing their future?