Riona, a girl who feels sexual desire even when she does nothing, suffers from persistent sexual arousal syndrome. A disease in which she cannot suppress her sexual arousal when she sees a man. This leads to the younger sister having a relationship with her older brother. From then on, every day, the younger sister begins to desire her older brother. The younger sister's cries of the heart are written all over the unit bathroom. And her anguish. The older brother's love for his sister... only brings about further misfortune.
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