-sound of drop- A tokyo aquarium nestled quietly in the city center. Various rumors were whispering in the Takanishi Aquarium. Person fish are swimming, people 's spirit can be seen in the aquarium, all of the water in the aquarium turns red on the full moon night.Mayumi and Hime-no junior high school student go to the Tottori Aquarium in search of the rumor. At first it was just a fun aquarium, but the circumstances change completely after the missing younger sister Mari is appearing in front of the Mayumi in the same way as it was five years ago. Mayumi fights with Hime-no from trivial things, runs alone. Everything was confined in a funny aquarium of fear .... Additional -fall into poison- The fate that was supposed to die was changed and the girl encounters it again. The hidden truth becomes clear, the story goes deeper and deeper into further abyss. In addition to the two mysteries of the Takanishi Aquarium, and two new routes that make you asleep in the past that sleeps in the past, it also includes a story about the extraordinary story that "Sakuragi Sand Night" depicts the full moon day, until the full aquarium. Source: The Developer Website.