Zero's Familiar Chevalier Vol 4 by Noboru Yamaguchi. A Fantasy manga rated Older Teen, published in English by Seven Seas in 2015.
Ordinary teenager Saito was summoned to the magical land of Halkeginia as the familiar of Louise, a noble mage so hopeless at magic she's nicknamed Louise the Zero. Now war has come to the kingdom of Tristain, and as invading forces close in, Saito and Louise find themselves on the front lines, where Louise's rare and mysterious magic may be the kingdom's best hope. A fantasy adventure comedy based on the hit light novel series.
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