Kunon the Sorcerer Can See, Vol. 4 (light novel‪)‬

Kunon's duel with the Inferno Prince has finally arrived! With the faculty, his Advanced class classmates, and perhaps even the world's greatest witch in the audience, it’s bound to be an exciting match. It's also time for Kunon to take on his next research project—developing a box that can hold magic. Despite plenty of reliable helpers, the project is sure to be a huge endeavor. Meanwhile, a strange phenomenon turns the school into a forest overnight... Kunon plumbs the depths of his craft as his first year in magic school comes to a close.