As the summer's end approaches, a Japanese sister retreats to her room, haunted by memories of past encounters. She strips down to her delicate underwear, the soft fabric caressing her skin, a stark contrast to the heat outside. Her thoughts wander, fingers tracing the lace edges, dipping beneath to tease her wetness. She leans back, eyes closed, lost in a world of her own, her breath hitching as she brings herself to the edge, over and over again.