Raised in a district of other worldly beings, it has always been Tokoyo's dream to become a professional summoner. When he's finally old enough, he enrolls to the summoning academy, taking his first steps to his dream. However, there's a secret hidden deep within Tokoyo's worldview, which can turn the world upside down! On the day when the world changed, it transformed into something foreign and unrecognizable. After being sent into an otherworldly space created by Garden, a summon made by the Contra-true world summoning association, Tokoyo and his friends wander the realm, looking for an escape. Garden's true aim is to have Tokoyo kill him with his own two hands, which will release the distortion within Tokoyo, fusing all of the other worlds with reality and distorting the world as a whole!! But how can Tokoyo be stopped after the expansion begins...?