When Sakura Ikegami announces her engagement, the close bond between her and her younger brother begins to unravel. For the first time, he becomes aware of his romantic feelings for his sister and overwhelming jealousy toward her fiancé, drawn to Sakura's mature, alluring body despite their blood relation. As physical contact between them ignites hidden desires, Sakura gradually recognizes her own undeniable emotions, falling into a tangled web of forbidden love. While her fiancé lies ill in bed, the siblings consummate their passion, deeply connecting as Sakura reaches a shameless, intense climax. A raw creampie sex affair within this near-incestuous relationship challenges the very fate of their lives.