Blood-related siblings deepen their forbidden relationship. Alone together at a secluded hot spring inn, the brother and sister spend intimate time with one another. The younger sister, Yuki, deeply loves her brother and is always wet, eagerly waiting for him. The brother embraces her body, bringing her to climax again and again. Throughout the trip, the sister obediently follows her brother's commands, continuously fulfilling his desires. Using this journey as an opportunity, the brother aims to completely dominate his sister's senses.