神秘の子　魔術が使えない落ちこぼれ、数秘術で成り上がる（コミック）

Synopsis

On the day of his high school graduation, Raku Nanairo and his entire class gets in an accident and reincarnates into another world. He is reborn as "Luluku," the sixth son of a Duke. While he hopes for an easy second life, he is unfortunately abused daily by his family because he cannot use magic. Desperate to become independent and escape his home, Luluku suddenly realizes he possesses the ultimate cheat skill: "Numerology." This ability grants him a wide variety of powers, including healing and summoning, and will drastically alter his fate... Join the journey in this isekai cheat adventure about rising to glory alongside a band of eccentric companions!