Dragon and Ceremony, Vol. 1 (light novel)

To fulfill his master's last request, half-human wand craftsman Ix must
repair a staff
belonging to a girl named Yuui. There's just one problem-in
order to mend the staff's
core, Ix must obtain the heart of a dragon, the
last of which supposedly died out 1,000
years ago. Running up against a
strict time limit before his contract expires, Ix must
somehow find a long
lost dragon and repair the wand all by summer's end.