Tsukasa knew her son was masturbating while watching videos he had secretly recorded. One day, after viewing the footage herself, she felt a deep ache in her chest. It was an extensive collection, intimately documenting her daily life. Seeing Shinichi masturbating while watching her, something stirred within Tsukasa—perhaps it was love. The next day, finding Shinichi resting on the bed, she lay down beside him and instinctively reached out. Her hand moved toward his crotch. The emotion that had begun to grow inside her heart was now in motion.