The Ossan Newbie Adventurer, Trained to Death by the Most Powerful Party, Became Invincible

新米オッサン冒険者、最強パーティに死ぬほど鍛えられて無敵になる。

Rick Gladiator becomes an adventurer just past thirty, when everyone assumes it's too late to start. What nobody knows is that Rick spent his obscure years training under Orichalcum Fist, a legendary party made up of the continent's strongest fighters, and came out the other side with S-rank combat ability. Now he takes on dragons and vampires alike, quietly outclassing adventurers half his age who underestimate him for his years. This manga adapts the light novel of the same name.