Roshutsu Playing Game -final- -nijiirononiji- -

"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 Playing Game -Final- -nijiirononiji-

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