Kotone Suzumiya is a serious and pure girl by nature, but at home she lives solely for her older brother. Bound tightly with hemp rope, she is stimulated on her sensitive lower body, yet expresses nothing but pleasure. For her brother, she willingly services the penis of a stranger, saying, "If it's for you, big brother..." Each time she is trained and used, her heart grows increasingly attached to him. Desiring to be even closer to her brother, her masochistic love intensifies. This work captures every moment of twisted desire, weaving together her innocent feelings with the profound depths hidden beneath.