This is Tsutomu Nihei's Tower Dungeon. I bought volumes 1-4 used. They have a stamp on them, possibly from a net cafe. However, they are in good condition with no stains or tobacco smell, so I think you can read them without worry. I bought volume 5 new. (As of October 2025, volume 5 is the latest release) - Volumes: 1-5 #TowerDungeon #TsutomuNihei - Genre: Fantasy This is recommended even for those who are reading this author's manga for the first time! Thank you for looking.