Heyo Everyone!

I'm so sorry I haven't been active in this world! :( I will try to be >O<
It's a TuneIt Round (for those who still remember XD). If you don't, instructions are listed in the introduction of this world!

This one is from an anime :3

SONG: LINK
Hint #1: The anime has two seasons with a quite popular manga ongoing.
Hint #2: Mystery/historical genre.

Closed:
Answer: Monochrome Kiss (Kuroshitsuji)
Winner: TwinkLes

Thanks for guessing! :)