Tamaki Kaigane’s manga adaptation of Kōji Yanagi’s Unbreakable ~Yaburezaru Monotachi~ is heading into its final arc, and it is leaving its magazine to get there. The 23rd issue of Akita Publishing’s Young Champion announced the move on Tuesday: the final arc will continue on the publisher’s YanChan Web platform next spring.
Nothing about the ending itself was revealed. No chapter count, no end date, only the arc and the platform switch. Kaigane will keep drawing the series; the change is where it runs, not who makes it.
The setup
The story is historical fiction built around a real writer. It takes place under the Peace Preservation Law of 1925, a law aimed at people holding Marxist beliefs. Takiji Kobayashi, a proletarian author, picks the brutal conditions aboard a crab cannery ship as the subject of his next novel. That choice puts him in the sights of the special police task force that monitors ideological threats, and two spies are sent to watch him.
Kobayashi was a real writer. He published The Crab Cannery Ship in 1929 and died in 1933 while in police custody, at 29. The novel puts him in the middle of a story about the state watching its own writers rather than retelling his life, which is why the spies matter more than any single scene of him at a desk.
Serialization history
Kaigane launched the manga in Young Champion in August 2025, which makes the run roughly a year and a half old at this point. Akita Publishing shipped the first collected volume on June 19. Kadokawa published the original novel in 2024.
Anyone who follows Yanagi’s work will recognise the shape of the premise. His Joker Game novel came out in 2008 and won the Mystery Writers of Japan award in 2009. Yū Irie directed a live-action film version that opened in Japan in January 2015, and Yanagi followed the original book with three sequels, Double Joker, Paradise Lost and Last Waltz, published in 2009, 2012 and 2015. The series has more than 1.35 million copies in print.
Joker Game also had a busy life outside print. Production I.G’s television anime premiered in April 2016, Crunchyroll streamed it as it aired, and Funimation produced an English dub. Subaru Nitō drew a manga adaptation of that anime for Mag Garden’s Comic Garden starting in February 2016 and finished it in 2018. Stage play versions opened in 2017 and 2018. The pattern is consistent: Yanagi’s spy fiction tends to get adapted more than once, in more than one medium, and novel-to-manga projects of this kind keep appearing, from Nao Emoto’s take on Mokuyōbi ni wa Cocoa o to smaller titles most readers never see announced.
Why magazines hand finales to their web platforms
A magazine-to-web move near the end of a serialization is common enough in Japan now, and it usually means one of two things. Either the arc needs more pages than a monthly or biweekly slot can give it, or the publisher wants the finale where it can push notification traffic and same-day chapter sales. Akita Publishing has not said which applies here. What it did say is that the final arc starts on YanChan Web next spring, which makes this a transition rather than an ending announcement. The story still has to be finished.
That pattern is familiar to anyone watching how manga ends these days. Other series have entered their final arcs with a volume count attached; this one arrives with a platform change instead, which leaves the length open.
What it means for readers
Nothing has been announced about an English edition of the manga. Joker Game is the entry point most people outside Japan have, through the 2016 anime. If the manga’s final arc draws attention back to the novel, that is likely where new readers will land first.
The practical takeaway for current readers of Young Champion is that the series will disappear from the magazine after the current arc wraps and reappear on YanChan Web in the spring. Anyone collecting the volumes has one so far.
Source: Anime News Network, citing Young Champion issue 23.
Featured image: the cover of Unbreakable ~Yaburezaru Monotachi~ volume 1, credited to Kōji Yanagi and Tamaki Kaigane, via Anime News Network.
