Based on the archive naming convention used by Ryuugames, the ID corresponds to the visual novel " Island " (specifically the version released by Frontwing).

: The plot revolves around the "Three Great Families" and a mysterious soot-borne disease. It successfully blends local folklore with hard sci-fi elements like cryogenics and time paradoxes, keeping you guessing until the final reveal.

: Unlike many visual novels where choices feel arbitrary, Island features a sophisticated flowchart. This allows you to visualize the branching paths and jump between specific points in the story, making the pursuit of the "True End" both manageable and rewarding.

Here is a solid feature breakdown for a review or product highlight: