About This Game

The second installment of "The Detective Kibukawa Ryosuke Case Tale" series!
The "Kairoukan" is a strange building surrounded by the sea on all sides.
Inside the building, which is sealed underwater, the curtain rises on a horrifying tragedy.

【game System】
This is a mystery adventure game in which the player solves a series of difficult cases that occur in a fictional town called Marihama City in K Prefecture.
The player controls the main character in the scenario and solves the mystery by selecting commands in the conversation and deduction parts, and by gathering information and evidence that will provide clues to solving the case.
The story progresses by selecting commands, so even beginners can easily play the game.

【Story】
This case is set in "Kairoukan", a strange building in the middle of the sea, which was built by the former chairman of an architectural firm famous for its eccentricities.
The story begins when you are invited to an event to celebrate the inauguration of the building.

Seven invited guests are at the destination. The owner of the "Kairoukan", who never appears. And then...
A tragedy occurs in the mansion, which is closed underwater.

Who is the culprit? What is the motive? And what is the secret hidden in this building? The truth lies in the dark sea...

Mature Content Description

The developers describe the content like this:

This game may contain bloodshed, violence, and other content not suitable for all ages in the course of the story.