Feeg works in the Hero’s Party as a Skill Mechanic, using his ability Skill Maintenance, which allows him to adjust and fix defects in people’s skills. However, because his power is considered useless in direct combat, he is suddenly fired without warning. With nowhere left to go, Feeg heads back toward his hometown—until he encounters a mysterious girl named Lilia. When he performs Skill Maintenance on her, it triggers a dramatic change: Feeg awakens a new ability, Modification, a power that can drastically enhance skills. With this newfound ability, Feeg begins improving not only himself but also the abilities of those around him, gradually regaining hope in the possibilities ahead. ——And now, armed with his upgraded Skill Maintenance and joined by new companions, Feeg once again sets out on the road of adventure, determined to build the strongest party!