“Is this what you wanted?” the mirror whispered.
This was not madness. This was purpose.
It seems you're referring to (破滅の願望 第一章), which translates roughly to “Desire for Ruin: Chapter One” — possibly a doujin music track, a game BGM, or a fan-made composition, given the stylistic naming. Hametsu no Ganbou Daiisshou
The first crack appeared not in the sky, but in the mirror. “Is this what you wanted