A year ago, Ayako divorced her husband. When friends asked, she claimed it was due to his infidelity, but the real reason was something she could never reveal—a secret she silently accepted. The truth was, she had fallen into an unforgivable relationship with her son, Satoshi, crossing the unbreakable boundary between mother and child. Rather than end this forbidden bond, Ayako sought to deepen it. Whenever possible, she pressed her lips to his, entwining their tongues in a taboo-laced affair. For her, these impulsive acts were proof of an unbreakable connection.