This is a tanko release which became possible all thanks to 
kappun who did the cleaning and a hell lot of redrawing. Volume 16 might also be possible if/when the scans are ready.
Chihayafuru, volume 17, chapters 89-93+omake
The next volume release, though, should be vol.4 of Mitsudomoe (yes, yes, finally it’s near completion).
Manga lovers