Jett Levine is a man who has been stricken with misfortune throughout his life. Even his one hobby--gacha games--fail him as he finds himself at a dead end and broke after spending all of his cash on the game. After an untimely death without warning, he finds himself reincarnated into the mystical world of Fantasia, with a new power at his disposal:

[Gacha System Activated.]

With the ability to use money to activate summons that span from skills, spells, familiars, and weapons, he is able to obtain weak or powerful summons--completely at random. While the ability seems fickle at best, he quickly learns its true power and what it is capable of.

However, in the world of Fantasia, he is not alone: there are others like him, called "Reincarnators": unique people that have reincarnated from Earth, like him, with systems of their own. Against monsters of myth and Reincarnators alike, Jett seeks to make the most of his second chance at life and take on the "Reverse King"--the villainous Reincarnator who looms over the world of Fantasia.