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。

冒険者としての強さの基礎となる魔力は、若いうちに鍛えないと成長しにくいため、できるだけ若いうちに冒険者になった方が良いというのは常識だ。It is common knowledge that it is best to become an adventurer when you are as young as possible, because the magical power that is the basis of an adventurers strength will hardly grow if you don train it while you are young. But this man, Rick Gladiator, who became an adventurer when he was over thirty years old, had the combat power of an S-rank adventurer, the highest rank in the world. In fact, Rick has lived an unimaginable life with the members of the legendary Orihalcon Fist, a party of the continents strongest adventurers. From dragons to vampires, Ricks fighting prowess, trained by his literally monster mentors, allows him to defeat elite adventurers one after another who try to underestimate him.