A story of 6 days with 5 people gathered around a small sparkling pool at Chiang Mai in Thailand. 4 years ago, Kyoko started to live in Thailand and has been working in a Guest house outside in Chiang Mai, leaving her mother and her daughter Sayo, in Japan. Just before the graduation of University, Sayo sets foot on Thailand to visit her mother with mixed feelings. However, emotional experiences with the people living there changes such feelings toward her mother.

An overworked career woman leaves her life in the city for an island vacation only to encounter eccentric local inhabitants.

On a quiet street in Helsinki, Sachie has opened a diner featuring rice balls. For a month she has no customers. Then, in short order, she has her first customer, meets Midori, a gangly Japanese tourist, and invites her to stay with her.

In Tokyo, actress Touko leaves the filming set of her latest project and comes across three people by random chance: she gives a ride to a man named Nagano, whom she has never met before; at a small theater, runs into Kikuchi, a former screenwriter; lastly, meets Yasuko at the zoo.

Set with three central figures, "Mother Water" describes the daily lives of people near the Kamo River in Kyoto, Japan.