: Natsuki Ikaruga, a boy who lost his mother and a leg in an accident, returns to his flooded hometown to find his late grandmother's laboratory.

: Earth's surface is mostly underwater due to unexplained sea-level rises.

is a celebrated sci-fi visual novel (VN) set in a near-future world where rising sea levels have submerged much of civilization. The "v1-3" in your query likely refers to a specific version or patch of the game, which is often distributed in compressed formats like .zip for digital delivery. 🌊 Setting and Premise

: While searching for a rumored "treasure" to pay off his grandmother's debts, Natsuki finds Atri , a highly sophisticated and emotional humanoid robot.

: Atri declares she will be Natsuki's "feet" until she fulfills her final command from her previous master. 🎮 Gameplay and Structure