Circuitdream.exe

Overview
circuitdream.exe is a Yume Nikki Fangame made as a crossover with the anime series [https://en.wikipedia.org/wiki/Yu-Gi-Oh!_5D's Yu-Gi-Oh! 5D's] created by Sango Tsubasa and developed by Felice.

Plot
You play as Antimony, and would supposedly explore the mind of Bruno, your younger brother who is in the hospital, using a computer application called "circuitdream.exe" to find out what happened to him. Unfortunately, development of the game ended before anything more than the character's room was programmed.