Shoujo Jiten - Vol. 3 Ch. 17.2 - Author's Animations

[MangaDex]

 

[GreyArea]

HQ for the second one:
https://www.youtube.com/watch?v=gENLc-vTimA

EDIT: They've also just posted this animation on twitter. No clue if that's Yachiko or Kuro Oni's Hisaki since they've got the same design, but maybe they're getting in the mood to start working on stuff again.

 

[Tersione]

That second animation especially looks gorgeous.

 

[Confetti]

Ooh, marvelous. Awesome animations once again

 

[faruq9854]

It never fail to amaze me for the animation this artist created, almost like part like anime or amateur anime at worst.

 

[themoobz]

great