Mahou Tsukai Nara Miso wo Kue!

Mahou Tsukai Nara Miso wo Kue! (魔法使いなら味噌を喰え!) is a light novel series by Sai Sumimori with illustrations by Shirou. An OVA was produced by AIC.

Plot
A world where the existence of magic has been known for a century as a mysterious power to rival science. However, the discovery of MISO — the Material of an Impediment to the Sorcerer's Orders — made magic into not a special power, but a technique that can be raised. One morning, while Shōta Hacchōya (a high school boy attending a magic academy) was tasting miso soup, a princess of Majieeru suddenly breaks in. Majieeru happens to be the birthplace of magic.