The world of Record Breaker is on the brink of nonexistence. Just before the announcement of the revelation, when life was normal, some who sought excitement signed up on a website promising to deliver fake videos of their deceased friends.

As people wondered what these videos could mean, an invasion began and humanity was forced to face an unprecedented struggle for survival in a catastrophe.

For the main hero and his friends, they defend humanity when the same website uploads an app on their mobile phones, summoning demons. From there, the newly formed demon tamers begin the fight to survive and save the future of humanity, but the protagonist's decisions are not without consequences. What he chooses can either save the lives of his friends or seal their fate.