As Japan's national comic, serialized in Shueisha's Weekly Shonen Jump, it is the少年 manga with the most chapters ever serialized. The tankōbon Japanese original has reached up to 144 volumes and the chapter count is still being updated. Moreover, this series also tops Shueisha's sales chart with over 130 million copies sold, surpassing both Dragon Ball and One Piece. The protagonist is Kanji Ryotsu (Ryotsu Kanji, ryōtsu kankichi), a delinquent police officer serving at the Kameari Park Front Police Station under the jurisdiction of the Tokyo Metropolitan Police Department's New Katsushika Precinct. The story often features contemporary Japanese popular culture elements such as gachapon capsule toys, dating simulation games, and variety show themes. If you have been collecting the individual volumes over time, you can observe the shift in these pop culture trends. It also reflects the changes in Japanese society through its storyline.