在北海道增毛町，和次子一起经营酒屋的本间信雄仍然忘不了两年前丧妻的伤痛，孤独地过著每一天。除了打理酒屋的工作外，信雄每天也会到8公里外的鮭鱼养殖场去，观赏场内的幼鱼，和工作人员美和子聊天。就在信雄亡妻忌辰的前夕，12年前离家出走的长子突然回来……

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.