This has been up for a few months already (actually) and I did not notice it (even though I have been visiting NHK world videos a lot, oops).
Anyway, Hikaru Katsuki, creator of Baby Steps! is involved on a NHK World series titled "Animation x Paralympics: Who Is Your Hero?". Each episode is a short animation (around 5 minutes) which features a certain sports with a theme.
Eiichiro and Natsu are in the 3rd episode entitled Wheelchair Tennis which features Shingo Kunieda, a Japanese wheelchair player.
You can still watch it (officially lol) here until November 11, 2019.