Im pretty sure I found the sauce!

• SauceNao SourceURL:https://yande.re/post/show/707221
• Source:sevenbees
• Similarity:92.17

Found On Trace.Moe with a similarity of 0.87: - Title English:

• Title Romaji:Kiriya Hakushaku Ke no Roku Shimai
• Title Native:
• anilist Id:11747