Raised by the world's most powerful evil dragon, Ryuuji, an orphan, plans to leave home at 15 but is challenged by his mother to defeat her first. Despite her high level, he persuades her to let him venture out, only to have her tag along. With his mother joining his party, she insists on interviewing potential members and takes on dangerous quests, overshadowing his efforts. As he faces constant struggles and setbacks due to his overprotective mother, Ryuuji must prove himself as an independent adventurer and a man.