Sound of Drop – fall into poison – is an HD remaster of the doujin title Shizuku no Oto from Aiueo Kompany, which includes new endings, scenarios, and CGs. I never played the original, but from what I hear it’s been given a complete overhaul. The story is a mystery with a smattering of horror, set in a strange aquarium called Manten Aquarium. An urban legend says that on the night of the full moon the Deep Sea Fish booth, which was closed down five years ago after a mysterious accident, opens and bizarre phenomena happen.
Our protagonist, Mayumi, has a connection to the aquarium – her little sister, Mari, disappeared there five years ago. She’s back for the first time since then together with her friend Himeno, but things soon take a turn for the worse as they find themselves inside the Red Manten Aquarium from the rumors where fish swim through the air and danger lurks past every door.