Detective Conan at 30: How a Long-Running Franchise Keeps Fans for Decades

The manga began serialization on January 5, 1994, and marked its 30th anniversary in 2024. The TV anime began airing on January 8, 1996, and reached 30 years on air in 2026. The first theatrical film came out in 1997, so counting from there, 2027 is the 30-year milestone.

The staggered milestone years for the serialization, the anime and the films may look like a simple matter of dates, but for the people planning campaigns they are an important condition. They give three years in a row to celebrate, and each time a chance to build a new way in.

In 2026, several projects ran under the banner "30 YEAR PROJECT": exhibitions, music, special TV programs, collaborations. Rather than concentrate the milestone on a single day, spread it out toward the next mystery, and that builds staying power.

Thirty years is also the span of a fan's life. Someone who started reading as an elementary school student now goes to the cinema with their own child. Because the work stays as it is, a person's own time becomes something you can measure against it.

The manga, the TV anime and the films starting in different years was a coincidence, but it became a strength. Because the anniversary can be celebrated in three parts, there's a run of years in which to create buzz, and no risk of burning out on one big, one-time project.

The hard part of an anniversary campaign is thanking existing fans and welcoming newcomers at the same time. Exhibitions and special programs work on the former, collaborations and music on the latter. Lining up projects of different character opens both doors.

A long-running anime faces the wall of having too many episodes to catch up on. Conan keeps a big mystery about the Black Organization, a shadowy syndicate of men in black, running for years while keeping a structure in which each case can be enjoyed in a single episode. The theatrical films, too, are basically complete in one film.

Longtime fans wait for the foreshadowing to pay off, while newcomers come in through a favorite character or a film. Balancing an unending saga with a stand-alone experience you can enjoy right now has kept the door open for 30 years.

The sheer number of episodes is, in fact, the biggest thing blocking the door. The moment they hear "over 1,000 episodes," most people give up before they start. What keeps a long-running work from drawing in newcomers is not its content but the fear of its volume.

Conan avoids this because each case is self-contained. Watch only today's episode and you can still follow it and enjoy it. Letting people actually experience that you can enjoy it without knowing everything dissolves the fear of volume.

Past episodes being available on streaming has been a tailwind for this work, too. Before, you could only wait for reruns, and even if you wanted to go back, there was no way. Now you can watch an episode that caught your interest the same day.

But when there's too much, people get lost even on streaming. The official side showing where to start, and presenting the important episodes together, is the work of turning something that can be watched into something that gets watched.

In the films, the character in focus changes year by year: Ai Haibara, Kaito Kid the phantom thief, Heiji Hattori, the Nagano Prefectural Police, and others. It lets you widen your interest to another character while still following a single work.

With the 2018 film Zero the Enforcer, passion for Toru Amuro spread widely, and the oshi-katsu of going to the cinema again and again became visible. Not forcing a switch of oshi but encouraging oshi-mashi, adding another oshi. That is the strength of a long-running franchise.

How the work handles it when popularity concentrates on one character is also worth watching. Rush to increase their appearances and you speed up the consumption; ignore it and the heat cools.

Conan is thought to have lasted so long because it has kept popular characters within the main story. Instead of a one-off popularity campaign, it builds them into a necessary position in the story. It's a way of taking in buzz within the structure of the work.

A large cast also makes things hard to manage. Focus on one character and the fans of another have to wait, so how the order and the intervals are set directly affects satisfaction.

In Conan's case, the clear cycle of the annual film makes the waiting time predictable. Even if it isn't your character's year, you know theirs will come. Being able to see why you're made to wait is a condition for waiting without leaving.

A film is released every year, and trailers, theme songs, bonus items and collaborations build anticipation before it opens. Going to the cinema, watching again and again, choosing merchandise, talking about your impressions on social media: watching the work expands into a day-long event.

Box-office revenue and attendance are results, but what stays with fans is the memory of who they watched with and which scene made them cry. A design that turns big numbers into personal memories supports the yearly return.

Watching several times is another feature of this work. The first time you follow the story, the second you check the foreshadowing, the third you watch only one particular character. Even with the same work, you can change your reason for watching.

The months before release are part of the fun of this work, too: the poster reveal, the theme song announcement, the trailer release. Every time information comes out, speculation stirs, and time piles up before you even see the film.

When even the waiting time is designed, opening day becomes a destination. Can the period before you see it be a time of taking part rather than just getting through? That is one reason a once-a-year work keeps going.

For the makers, releasing every year is a considerable burden. They still don't break the cycle, probably because the habit disappears the moment it is interrupted. An annual tradition is hard to restore once it has been skipped.

Predictability matters a lot to viewers, too. If you know there will be a new film when spring comes, you can keep your schedule clear. The promise that it comes every year has itself become part of the content's value.

The 30th-anniversary projects also emphasized ties with music, such as the rock duo B'z's new song "Heaven Knows" and songs by singer Mai Kuraki. Beyond the time you spend watching the anime, they open paths: listening to the songs, going to live shows and exhibitions, and coming into the work as a fan of the artist.

Artists who have been involved for a long time are an asset for the work. The more songs there are, the more chances that artist's fans have to encounter the work, and over time a two-way relationship builds up.

A collaboration has to do more than line up names: it has to translate the work's mysteries and emotions into sound. What matters is creating a shared doorway through which another fandom can step into the same story.

Theme songs continuing in the same form for a long time also work in this franchise's favor. Thirty years' worth of songs that bring the work to mind has built up, and the music itself has become a doorway to memory.

A long-running franchise that relies only on past popularity is hard for newcomers to get into. It needs to be edited into a form today's fans can discover, through streaming, short introductions, character-by-character projects and tie-ins with contemporary music and events.

"Editing" also means cutting things away. You can't recommend all thirty years, and deciding what to show first is what building a way in means.

Another challenge is the generational change among the makers. Over thirty years, the people in charge and the people who lend their voices change. How that change is communicated becomes as big an event for fans as the content of the work.

Don't set the memories longtime fans have built up against the surprise newcomers feel for the first time. A culture where "I've loved it for years" and "I started today" can share the same place will support the next 30 years.

A work that has run for thirty years has many people who drifted away along the way: those who watched as children and stopped without noticing. They aren't newcomers, but give them a reason to come back and they are the people most likely to return.

Anniversary projects include exhibitions and music partly to reach this group. Even if they can't keep up with the current episodes, they can step into the memories. Prepare a path back for the ones who left, separate from the door for newcomers. It's a design unique to a long-running franchise.

Detective Conan hasn't been loved for 30 years just because the work is long. To those who keep following, it has offered the next mystery; to those who joined midway, a case they can enjoy today; and to those who wait for the film every year, a new oshi. Don't end the story; add doors. That staying power builds the future of a long-running franchise.

What other works can learn from this is structure, not scale. Put a long mystery at the center and line up self-contained ways in around it. Even works with fewer episodes can build this form.

Conversely, the less a work is in a hurry to conclude, the less it can neglect designing its doors. Not ending is not in itself a value. The question is whether, while it hasn't ended, it stays open to anyone.