A warrior ruled by chaos and darkness and killed his family in another world. One day, crazy about madness and revenge, he knows about the existence of Kelg's bar. There, the reborn (?) Are searching for friends to subdue the Demon King day and night.<br>Urus immediately goes to the bar to be chosen as a rebirth, but he is imprinted with the mysterious word “R” and is recognized as a weak by an unknown summoning ceremony (Gacha). And touch the darkness of the world !!!<br>What is R, an unknown summoning ceremony !? And what is the darkness of the world !?