I have heard of it yeah, and I am interested!
I actually bought it on Bookwalker a long time ago and have been meaning to read it for ages. 
Itâs always next after finishing the main magazine! But then a new issue comes outâŠ
Itâs specifically a collection of stories from artists with series in the main magazine, where if I remember right they were encouraged to do something different genre-wise than their ongoing series. So Itâd be especially neat the more of the artists youâre already aware of (though itâs old enough not all of their series are ones I read or caught up with when they were running).
Harta has a few interesting spinoff/extra issue magazines. There was one year where they filled the gap months (thereâs no new Harta in January or July) with an all one-shot magazine called Terang a concept I kinda wish theyâd kept up with. Nowadays they use the ăă«ăżăȘă«ăż name for their free comic website. The series and one-shots on there are neat! And probably the same kind of thing youâll find in that collection. (But unfortunately they donât keep chapters up on that website so series that have been running for a bit are missing their middle chaptersâŠ)
Anyway, thanks for thinking of me, and itâs definitely a neat find!!