High school student Nanairo Raku was involved in an accident along with his entire class on graduation day and was reincarnated into another world as "Ruruku," the sixth son of a duke's family. He thought it would be an easy second life, but what awaited him were days of abuse from his family because he couldn't use magic. Ruruku was anxious to become independent and leave home as soon as possible, but one day he realized that he possesses the ultimate cheat skill called 【Numerology】, which has various powers such as healing and summoning. That skill changes his destiny significantly…. A reincarnated cheat adventure tale of growing up with quirky companions!