The young married couple, the Hinokis, had enjoyed a smooth and harmonious relationship since their wedding. The wife, Ren, remained deeply devoted to her husband, yet as a woman, her sexual desires were constantly simmering beneath the surface. However, every Monday, her husband returned home late from work, and Ren found herself increasingly gripped by a vague sense of melancholy. On one such Monday, after seeing her husband off, Ren wore a different expression—one filled with quiet anticipation. This subtle shift hinted at the awakening of her long-suppressed feminine instincts, ready to emerge in her husband's absence.