99% match as far as i can tell
Character: Hoto Cocoa
Artist koi (koisan)
Art type: official
Artist is a lazy dipshit who drew this pose and kept recomposing it in different official material. So there's multiple dead ends There seems to have been some merch drop w/ this available at some point.
Sources:
https://x.com/usagi_anime/status/1590996837565333505/photo/1https://gochiusa.com/bloom/news/n02430000.html#goodsSearch terms:
For the event ->「ご注文はアトレですか? in 秋葉原 ココア 描き下ろし イラスト」
For the specific merch -> アクリルプレート<So cute girls>
