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Akarui Kazoku Keikaku
明るい家族計画
A college student's life takes an unexpected turn when his younger sister returns home, and their relationship begins to blur the lines between sibling affection and something far more intimate. As they spend more time together in the family home, the quiet tension between them grows, pulling them into a secret world that defies social norms.
What starts as a moment of weakness soon becomes an all-consuming obsession. Trapped between guilt and desire, the two struggle to hide their forbidden bond from the world around them, knowing that once crossed, there is no turning back. But as their feelings intensify, they must decide how far they are willing to go to hold on to each other.