Shiho had always been shy and avoided close relationships with anyone, but she was genuinely happy when she made a good friend. This friend was Atsushi, who came to visit her every day—a kind and considerate person on the surface. However, he harbored a cruel and wicked side that remained hidden. Unaware of his true nature, Shiho felt nothing but comfort in Atsushi's presence. One day, she was exercising in a revealing leotard, calmly sweating through her routine. Unbeknownst to her, a sinister figure was approaching from behind—closing in at that very moment.