Comment by Knight on Houkago no Etude - Vol.2 extra.

I think we saw the same tiktok

same here
it was when black hair got jealous since the boyfriend was dancing with a balerrina.

it's the scene in chapter 6 but the chapter is missing here if you want to read it , read it here
https://myreadingmanga.info/hirune-cyan-houkago-no-etude-vol-2-eng/

why didn't they include it is was so cute  
also thank you for sending the link