It sounds like you're looking for a for a song or story titled "Roshutsu Playing Game -Final- -nijiirononiji-" .

The filter slips, the truth begins to bleed This playing game—it’s all I ever need

"The final round. No resets. No retries. Your true color... was always black inside the rainbow."

Ni-ji-iro no ni-ji... Mienai... mienai... Game over. Play again? (Deny / Accept)

Roshutsu, roshutsu, tear the veil away Playing game, final stage—nothing left to save Rainbow-colored rainbow, but the light is just a lie Expose my heart, expose my crime—watch me as I cry

Since this appears to reference a specific track (likely from the VOCALOID/UTAU or doujin music scene, possibly related to Roshutsu (exposure/漏出) and nijiirononiji (虹色の虹 - "Rainbow-Colored Rainbow")), here is a written in the style of a dark, psychological electronic song (similar to Maretu or Utsu-P). Text for: "Roshutsu Playing Game -Final- -nijiirononiji-" (Verse 1) Shutter sound, the flash is blinding Another secret I’ve been hiding Pixelated face, distorted frame Calling out your username again

Mirror mirror on the LCD Who's the fool who wanted to be free? Log in, log out, but the data stays Scars become the algorithm's maze