Dominating Modern Dungeons with Ancient Magic

Synopsis

The world was turned upside down when dungeons suddenly appeared. Only “Slayers” with special cheat-like powers known as Ideas could take down monsters, hoarding all the wealth and fame. Tenjin Sakurazaka, a young man struggling in poverty, unexpectedly regains memories of his past life. Armed with the “magic” he once mastered, he now has to step into the dangerous life of a “Slayer”...!?