This is a doujinshi made by the Deviant-art user Namie-kun. They unfortunately deactivated their account and only their fan club still exists on Deviant-art - https://www.deviantart.com/namie-kunfc

I don't remember what ethnicity Namie-kun is but i think they live in Europe or Asia so I don't think this doujinshi should be under the western tag. This doujin is read right to left like a regular doujin though.

Scanned by me (Adorable Doujinshi Scanlations) https://adorable-scanlations.blogspot.com/?zx=55e1b7fb7e27217b

direct download link - https://www.mediafire.com/file/8fmippa39k9hdd2/%2528Namie-kun%2529_Some_Bunch_Of_Vocaloids.zip/file