Treated as incompetent → In fact, the strongest adventurer!　Magic value is 1, which is as close to 0 as possible, and the lowest adventurer rank, "F".

Nine spends his days as a vanguard (attacker) in a party that has found him, but he and his beloved cat, Enu, are forced to do all the chores.

However, one day, the leader sells off the black sword, a memento of Nine's father, without permission, and even uses violence against his precious Enu and Nine's patience reaches its limit! "I'm quitting now!'' Nine, determined to leave the party and start a new life, is suddenly confronted by an S-rank adventurer "Dahlia the Flash''.

And then he is scouted by the strongest party on the continent, "Red Hawk"...?　The super-fast otherworldly battle fantasy finally begins!