I would like to know which anime this is- (Please refer attached picture below) )
I am not sure whether this is right or not but I believe this from what I mentioned in the comments sections, that this is probably Sora Suiga. I think this is some type of Vocaloid that was developed by the company Ameya/Ayame (Utau is only the name of the program sorry). From having a read on Wikipedia, it appears that Ameya/Ayame specialises in Japanese singing synthesizers, per the idea that I got that this is probably a vocaloid.
He also has a female counterpart called Sara Suiga and from reading I think you can use these voices possibly for free but only works for Japanese language only.