Yoiyami Densetsu: The Legend of Twilight is a fan-made Touhou Project 2D action-adventure game developed by Otter's Arcadia, featuring Rumia as the protagonist.

One day, Rumia decided to take a nap in the mountains. Suddenly, while napping, a fog rolls in. When she opened her eyes, she saw the familiar temple grounds, but something is wrong... things aren't what they seem... Rumia's involved in an incident!