
See? This is why I don't want to read anything tagged tragedy. But every time...
And now I'm crying. Not just because of the ending. Everything about this work is just...

Try reading manga by est em. While reading Momentum, all I could think was that it reminded me of est em's oneshot collections.

Sure, try:
-Show ga Hanetara Aimashou
https://www.mangaupdates.com/series.html?id=7215
-Sakuhin Number 20
https://www.mangaupdates.com/series.html?id=48964
-Ever After
https://www.mangaupdates.com/series.html?id=117026
Like Momentum, est em's BL is poetic/reflective, incorporating art (music, dance, painting) and there's a sense of melancholy. And her works have non-Japanese settings and characters. The art styles are pretty similar, too.
(Unrelated, but if you like centaurs, est em's centaur stuff is fun, too.
https://www.mangaupdates.com/series.html?id=65769
https://www.mangaupdates.com/series.html?id=65094
)

Can I add https://www.mangaupdates.com/series.html?id=20384
A bit different but gave me the same feel
Wow he has totally been brainwashed...
I think he’s faking it- trying to get the nice interest to let him go. I think Seung has given up hope...
Maybe so.. at this point it's too effed up to even rationalize
Now that I can’t deny. ╮( ̄▽ ̄)╭