Mashike, a city on the Japanese island of Hokkaido. Nobuo Honma is a 63-year-old sake producer. He has lived with Yasuo since his wife died two years ago. Yasuo is his youngest son to whom he has entrusted his trade. Every day Nobuo goes for a walk which leads him to a fish-breeding center, located in the mountains. He fills his loneliness by attentively observing the development of thousands of little fish poured into the pool. The second anniversary of his wife's death approaches. Nobuo insists on the presence of Ryoichi, his elder son whom he hasn't seen for a long time. Nobuo and his two sons, along with their partners, gather for the commemoration. Unspoken feelings resurface and clash with each other.