Yakisobapanman and Uncle Negi embark on a mission to safely deliver the young Pepper Trio and their precious cargo to Vegetable Village for the upcoming carnival. However, their journey is fraught with danger as Baikinman and his cronies attempt to snatch the cargo along the way. To their surprise, a masked swordsman named Naganegiman repeatedly comes to their aid in thwarting the villains. The question remains: who is this enigmatic ally and how does he possess such remarkable skills?