Daisuke, also called Bontenmaru Tasuke or nicknamed "Gatten Taro," is an eleven-year-old student at Edo City's Metropolitan Police Academy in the 23rd century. His driving ambition is to become a top-ranking police officer, eliminating crime to create a safer city for its residents. Achieving this requires him to earn ten Edo Police Badges through his studies and accomplishments at the academy, the essential requirement for full qualification as a policeman.

He tackles his training with earnest dedication, fueled by a powerful sense of justice and a desire to confront Edo's criminals. Despite his serious efforts, he faces repeated setbacks and failures throughout his journey. These persistent challenges render his path to becoming a full-fledged officer long and arduous, constantly testing his resolve and perseverance.

His story revolves around navigating the academy's rigorous demands while balancing friendships and rivalries. Key figures shaping his experiences include the supportive companion Omon-chan and adversaries like Darth Benkei, who embody the criminal elements he seeks to dismantle. These relationships contribute significantly to his growth as he learns to navigate both personal and professional obstacles.

Daisuke's background highlights his deep-rooted commitment to law enforcement from a young age. His motivations spring from a clear-eyed recognition of societal problems and a firm determination to address them through his role in the police force. The series chronicles his ongoing development as he strives to balance his ideals with the practical realities of his training and missions.