Original Theme: Higan Retour ~ Riverside View
Arranger: ziki_7
Circle: M.I.W
Album: Sound Vision ～幻視調律～
Image by hima: http://danbooru.donmai.us/posts/1232189
Classic ziki_7 here. This album's probably not very well-known, but it has some other nice tracks by the various collaborators: one that I'm particularly fond of is 米※'s arrangement of Fantasy Corridor from ZUN's Strange Works.
I can't help but feel like it's been a while since I've heard ziki_7 turn out something more jazz-inspired.