Come to think of it, after all this time, realised it's odd there's no artist's name attributed...

Claverhouse said:

Come to think of it, after all this time, realized it's odd there's no artist's name attributed...

I was unable to verify the illustrator who draws the official 4-koma, since it was never uploaded to Pixiv and is only available from their game page and official Twitter, and it's pretty unlikely that the character illustrators are responsible.