[TOMT][SONG][2010s] Vocaloid song gone off my radar

I feel stupid asking this as I’m sure someone just knows this and there’s a bunch of versions of this song that I just missed but…

I can’t remember much besides I listened to this in the car a few times. Found on Youtube, it was a vocaloid song between Hatsume Miku and another, possibly Otomachi Una but I’m uncertain. They may have been holding hands during the entire song as a still image with their backs towards the viewer. They stood in front of a door, all of which was lineart and in a zooming space background.

It was a really melancholic song with a happy message, it didn’t really have much variation through the whole thing. If only I knew how to read Japanese to help my search lol.

[TOMT][SONG][2010s] Vocaloid song gone off my radar