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Synopsis

After their parents split, Akira takes on parental duties for his sister Yui, becoming responsible for her daily care. Over time he perceives Yui’s maturation and finds himself unable to contain long-standing sexual urges toward her. His secret longings escalate from private fantasies to illicit nighttime intrusions into Yui’s room, where he engages in sexual acts with her while she appears to sleep. Yui, however, is actually awake during these encounters and does not intervene, even after revealing that a classmate has expressed romantic interest in her. The story centers on the shifting roles within their household, the emergence of forbidden attraction between siblings, and the emotional tension and moral conflict that result from Akira’s actions.