Sound of Drop: Fall into Poison

Manten Aquarium is a quaint aquarium in the heart of Tokyo, surrounded by numerous urban legends. On the night of a full moon, its waters are said to turn to blood, while man-faced fish lurk within. Junior high school students Mayu and Himeno visit Manten Aquarium to investigate these urban legends. At first, the investigation is fun, but everything changes when they catch a glimpse of Mayu's missing younger sister, Mari. As they pursue Mari's shadow, the wheels of fate begin to turn.

In Sound of Drop: Fall into Poison, students Mayu and Himeno investigate the urban legends surrounding Tokyo's Manten Aquarium. Their search takes a darker turn when they glimpse the shadow of Mayu's missing sister, Mari, drawing them into a mysterious supernatural ordeal.