The Tachibana couple moves in with her husband's parents to escape their financial struggles. Mizuki begins to feel guilt and remorse as she realizes she is burdening her father-in-law, Hanbee. Noticing her pure and innocent nature, Hanbee gradually reveals his true self, driven by uncontrollable desire. Hanbee's burning cock entwines with Mizuki's sensitive body, intensifying her pleasure deeper and deeper...