Kunon the Sorcerer Can See, Vol. 3 (light novel)

Genius sorcerer Kunon has gotten his business on track and won the rare honor of concurrent membership in three of the school´s factions. Now, he plans to start joint research projects with his illustrious upperclassmen, including on methods for breathing underwater. This topic eventually expands into a proposal to search for sunken treasure, and Kunon heads out to the ocean! The blind sorcerer´s repertoire continues to grow as he delves further into the mysteries of magic, defying all common sense!