Kunon the Sorcerer Can See, Vol. 6 (light novel)

Gioelion’s cousin, Serraphila Quartz, has joined the Advanced class as Kunon’s underclassman, and just as Kunon once did, she needs a plan to make money. Kunon suggests she use her earth attribute to develop a new magic tool, and he’s sure the result will sell. Even the local merchants are getting excited, but will it really work? Then, it’s time for another look at the past adventures of Zeonly, Kunon’s teacher, during his own days at magic school.