Dear daughter, conquer the strongest path!Richard, a veteran adventurer with the nickname ``Good Trainer,'' decides to retire because he feels that his abilities are reaching their limits.One day, he happens to meet a shabby little girl, Sierra, in a back alley and decides to raise her as his own daughter.Richard is clumsy but loves Sierra.In response, Sierra begins to pursue her dream of becoming the "strongest adventurer" that Richard was unable to fulfill.