Im pretty sure I found the sauce!

• SauceNao SourceURL:https://www.pixiv.net/member_illust.php?mode=medium&illust_id=100803277
• Title:「Fantia Creator’s Collection4」告知
• PixivId:100803277
• MemberName:ししょー🦇総集編通販ちう
• MemberId:5910442
• Similarity:94.94

Found On Trace.Moe with a similarity of 0.79: - Title English:Aria the Scarlet Ammo

• Title Romaji:Hidan no Aria
• Title Native:Aria the Scarlet Ammo
• anilist Id:8630