Ten years ago, mysterious, laid-back characters called Danpons arrived from another world and created dungeons that have become a part of everyday life in Japan.
High school student Taira Ichino is invited by friends to explore the dungeon at Osaka Umeda Station. However, the place is teeming with people, making it impossible to defeat monsters properly. All he acquires are minimal experience points and a mysterious canned item called the “D-Can,” whose contents and method of opening remain unknown.
Back home, as Taira yearns for a personal dungeon, the D-Can suddenly opens. Inside, he discovers a candy that allows him to learn skills.
Taira learns skills from the candy and delves into dungeon, determined to become the strongest dungeon explorer…



Popular Reviews
Autobiographical mangas are quite a rare find. Since editors usually have a clear grasp of what sells, very few authors get the opportunity to just share personal stories or experiences from their lives. This manga isn't thrilling, tear-jerking, or even particularly humorous. It's simply a reflection of life under a very specific set of circumstances, and it does this exceptionally well. You get an inside look at the daily routines, work environments, how minor offenders perceive life both during and after incarceration, and how it impacts the main character.
It's a comforting narrative of what might be one of the best possible jail experiences anyone could have, with an art style that perfectly serves its purpose. If you enjoy learning about people and how different parts of the world handle a common yet specific aspect of civil life, you'll adore this kind of story—something you'd never find in a Jump magazine.
I appreciate the theme of incarceration and prison life, but honestly, not much happens in this manga. I understand it's a biographical work, but this manga is essentially 30% mundane daily life in prison, 5% struggles inmates face, and 65% nonstop praise for delicious Japanese prison food. The protagonist wouldn't stop raving about the prison meals—it felt more like a cookbook than an actual story about life behind bars.
Art: 6/10
Story: 2/10
Overall: Learned a lot about Japanese prison food.
When I first read it as a teenager, I was completely amazed. While Japanese low-security prisons may seem appealing, people often overlook the fact that this story revolves around someone atoning for their crimes and facing the consequences.
It's mind-blowing to encounter such a narrative in a manga, especially from the perspective of the person who actually committed the crime. The artwork is exceptional and draws you into Kazuichi's emotions. There are also numerous everyday scenarios that resonate with the reader, all of which enhance the remarkable experience.
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