To counter the threat called 'mad spirits', people developed magic——Masou Academy is an university town that brings up people who master it, and the special strongest magical weapon Exmachina(furigana Spirit Machine). The boy who desperately pursues power despite being unable to use magic — Kazuha left this land once already, and now he entered it once again. Thanks to a special ritual he is able to use a magical weapon, he does it all for the sake of his childhood friend, Kikyo. However, the weapon that was born for his sake for some reason took shape of a girl......?! (Source: Baka-Tsuki)