if only he made a new doujin fully colored in this style like his old rei ones

unfortunately, as you can see on the top right, this was just a 1 page cover illustration for toranora's published manga work.
she looks familiar (esp her hair), but is she an original by any chance?

What horrifying proportions :x

[Kabushikigaisha Toranoana (Various)] Shinzui Vol. 1