Sound of Drop - fall into poison -

Nestled in the heart of Tokyo, the quaint little aquarium, Manten Aquarium.
Numerous urban legends have arisen from here.
On the night of the full moon the waters turn to blood and man faced fish lurk within.

Junior high school students Mayu and Himeno came to Manten Aquarium to investigate these urban legends.
In the beginning it was fun, but then.
They see a glimpse of Mayu’s missing littler sister, Mari.
The wheels of fate begin turning as they chase after Mari’s shadow.

--Before she realizes it, Mayu finds herself alone and lost in the crimson aquarium.

3 main routes, including more than 30 ends (4 true ends).
This game features numerous scenes of graphical violence and horror, it is therefor not recommended for children under the age of 12 and people sensitive to those contents.
This game was originally published in may 2014 under the title "Sound of Drop". This is its HD remake with improved graphics and additionnal routes.
Opening "Shizuku no Oto" - voice : Kuyuri - lyrics : Akeo - composition : Low 
Ending "C * U" - voice : Kuyuri - lyrics : Akeo - composition : Low 
English translation: Sekai Project 

The OST CD is also available here.