Title: ふたりごと (Futarigoto)
Artist: TRUE & Chihara Minori (茅原実里)
Album: Sincerely (Artist Edition)

Could'nt find this on YouTube yet.

The Violet Evargden OP album came in two editions: Artist (LACM-14711) and Anime (LACM-14712)

This track featuring Erica Brown (cv.Chihara Minori) is track 3 of the Arist Edition. I don't know if it plays in the anime because I haven't watched it.

Down-converted one time from CD rip (FLAC) to the max audio bitrate of YouTube MP4, for the absolute highest audio quality possible for playback on Youtube.

Enjoy!

(Victor Studio didn't do a great job mastering the album, unfortunately. However, this track survived much better than the main OP, which had quite the amount of dynamic range compression.)