D'JINN Vol1: Average+

Thousands of years have passed since the D'jinn King bestowed magic on the first Magis and has long left the world since. The world was at peace due to the teaching of the Magis but soon war spread across the land when they realised that magic could be weaponised.
The D'jinn king then send down the D'jinns, and from there a long tradition of peace by battle has begun, the Magi Cup.
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1) Ryuenji "Heiki" Saito is your average student with average grades, average magic, average looks, average everything. While attending the most average (~cough~worst) Magi School, Equos Academy, he soon found himself in a very, very wrong place at the very very wrong time.
Due to unforseen circumstances, Saito is contracted to an "average" D'jinn averagely. He is then persued by other D'jinns averagely before the Magi Cup.
But however, Saito's contracted D'jinn is not all that average when paired with an average mage.
And so begins this not so average journey.