Danbooru-based image board with a specialization in high-quality images.
cleavage cube dress harunoibuki heels koi_suru_kanojo_no_bukiyou_na_butai togawa_mayuu wallpaper

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So who's the artist of this?T.T
blooregardo said:
Cube
That's the publisher of the original game, not the artist.

And this is also definitely NOT drawn by the artist originally drawn for the game (i.e. kantoku).
What I meant was one of the artists of Cube, Kantoku is not one of them.
These are from cuffs/cube/whatever wallpaper collection 2015. Hopefully Hatsukoi would provide the artists' names, since they for sure exist in the cd-rom.