Shidu (しづ), is an illustrator who had created various PVs and provides illustrations to various producers. Shidu often provides 'dark' illustrations; thus the notable works being Abstract Nonsense and Tokyo Teddy Bear by Neru sung by Kagamine Rin.
For the song Inochi no Justitia, they used the name Sakurai (作成). This caused a lot of confusion among the fans about them being Shidu or not. However, they later announced on their twitter that this was a prank that they asked Neru to operate with.