Dark Water

No one loses their mind instantly. Sanity seeps away one drop at a time. Yoshimi simply wanted a better life for both herself and her daughter Ikuko. Unfortunately, such wishes may sometimes be hard to come by. The custody battle has grown embittered and hurtful, her new job is less than desirable, and Ikuko's schoolwork has taken a turn for the worse. But, Yoshimi has something bigger to worry about. Something upstairs. Something cold and dank. Something that should have never been. (official distributor synopsis)