Q.E.D.UNIV. ―証明終了― 3の高価買取価格

The ISBN 9784065429815 refers to "Q.E.D. - Shomei Shuryo" (Q.E.D. - 証明終了), a manga series written and illustrated by Motohiro Katou. Volume 3 continues to follow the protagonist, who solves various mysteries and cases using logic and reasoning. The series combines elements of mystery and mathematical puzzles, appealing to both fans of detective stories and those who enjoy intellectual challenges.
If you need more specific information about the plot or characters in this volume, feel free to ask!