Artist, nicoLive user.
Japanese name: 紅月夜 (reading is given as あつや, Atsuya)
https://www.pixiv.net/users/6879291
https://www.pixiv.net/stacc/haru9741
https://twitter.com/Atuya_benituki
https://twitter.com/intent/user?user_id=2841354882
https://seiga.nicovideo.jp/user/illust/5699604
http://com.nicovideo.jp/community/co2342203
https://www.nicovideo.jp/user/5699604
https://sketch.pixiv.net/@haru9741
https://twitter.com/haru974111