Since his parents divorced when he was a child, stage actor Toyama Taku has had little contact with his father. One day, he suddenly learned that his father suffered from cognitive impairment, and his current wife, the fuse that led to his abandonment of his wife and children, was missing. The father and son suddenly had more time to spend together, and the gap that had been there for many years finally had a chance to be filled. However, his father's memory began to become fragmented and increasingly out of touch with reality; the more the son tried to understand his father, the more he found that the gap that was filled seemed to be just the beginning of another gap. If the person who tied the bell has lost his memory of the bell, can the bell still be untied? Director Kei Chikaura, who has made his mark at international film festivals, and photographer Yu Yamazaki, who has shot for Hirokazu Koreeda many times, have joined hands to bring a new work. The whole film was shot on 35mm film with a strong style. Veteran actor Tatsuya Fuji also won the Best Actor Award at the San Sebastian International Film Festival in Spain for his superb acting skills.