If you want to support the artist:
https://www.dlsite.com/maniax/work/=/product_id/RJ01312192.html

I know hardening's work is not super popular. But they are one of the few artists that go in somewhat the same direction as Komekouji, who seem to have quit releasing new works. And I really like Komekouji..
hardening has the Body Mod + Pleasure Corruption vibe, which is nice. But they lack the same quirkiness as Komekouji and their works are a bit repetitive. I'll still pick them up when they are 50% discounted though.

001 -> Cover
002 -> Magic Student-chan standing portrait
003 - 109 -> Images with with text
110 - 216 -> Images without text