Hai yu Yu - Ocean and Fish

About this title

Hanhai wakes up in an unfamiliar room, for reasons unknown, her calf cut by some sharp object. As she investigates her surroundings, she finds a male corpse in the bathroom and a mysterious room with an evil magic circle drawn on the floor... What exactly happened here? [Edited from [url=https://store.steampowered.com/app/3583800/]Steam[/url]]