Detective Conan, with 106+ volumes & 1,136+ chapters, predates One Piece & has more overall chapters. KochiKame: Tokyo Beat Cops is the longest manga by volume count, with 201 volumes after a 40 ...

The comic book series currently spans 103 volumes. An animated TV series adaptation has also been airing since 1996. A new “Detective Conan” movie has been released every spring since 1997 ...