A middle-aged salaryman, exhausted from work, falls in love with a Kansai-speaking schoolgirl he meets one day in a park. After parting ways with her, he eventually marries another woman. When they meet again, he declares, "We've met once more. This is fate. I'll never let you go again. You belong to me forever," unleashing years of pent-up emotion. His heart becomes consumed by her, driving him into irreversible madness.